Owls of the United States and Canada: A Complete Guide to Their Biology and Behavior
By Wayne Lynch
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About this ebook
There is no group of birds more mysterious and fascinating than owls. The loudmouths of the raptor world, they peep, trill, toot, bark, growl, shriek, whistle, chittle, whoop, chuckle, boom, and buzz. Indeed, very few actually “hoot.” They have become the stuff of lore and legend?from the Roman myth that an owl foot could reveal secrets, to the First Nations belief that an owl feather could give a newborn better night vision. But the truth about owls is much more exciting.
In this book, natural history writer and wildlife photographer Wayne Lynch reveals the secrets of these elusive species with stunning photographs, personal anecdotes, and accessible science. The photos alone are masterpieces. Unlike most published owl photos, which are portraits of birds in captivity, the vast majority of these were taken in the wild?a product of the author-photographer’s incredible knowledge and patience.
Lynch complements the photos with a wealth of facts about anatomy, habitat, diet, and family life. For each of the nineteen species that inhabit Canada and the United States, he provides a range map and a brief discussion of its distribution, population size, and status. Lynch debunks myths about owls’ “supernatural” powers of sight and hearing, discusses courtship rituals, and offers personal tips for finding owls in the wild.
From the great horned to the tiny elf owl, this amazing volume captures the beauty and mystery of these charismatic birds of prey.
Named one of the Best Reference Books of 2007 by Library Journal
Wayne Lynch
Wayne Lynch became a fan of the Philadelphia 76ers in the mid-1960s as a teenager growing up in Pittsburgh. He started a small scrapbook about the team back then, but it was not until more than three decades later that he decided to tell the full story of the 1967 championship team he loved so much. Mr. Lynch is a longtime television journalist who is now Vice President of News and Programming at Newschannel 8, the 24-hour cable news service for greater Washington, D.C. He lives with his wife, Karen, in northern Virginia. His son, Matthew, lives and works in Philadelphia.
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Owls of the United States and Canada - Wayne Lynch
Owls of the United States and Canada
Owls of the United States and Canada
A Complete Guide
to Their Biology and Behavior
Text and Photographs by Wayne Lynch
© 2007 The Johns Hopkins University Press
All rights reserved. Published 2007
Printed in China on acid-free paper
9 8 7 6 5 4 3 2 1
The Johns Hopkins University Press
2715 North Charles Street
Baltimore, Maryland 21218-4363
www.press.jhu.edu
Library of Congress Cataloging-in-Publication Data
Lynch, Wayne.
Owls of the United States and Canada: a complete guide to their biology and behavior / text and photographs by Wayne Lynch.
p. cm.
Includes bibliographical references.
ISBN-13: 978-0-8018-8687-4 (hardcover: alk. paper)
ISBN-10: 0-8018-8687-2 (hardcover: alk. paper)
1. Owls—United States. 2. Owls—Canada.
3. Owls—Behavior—United States. 4. Owls—
Behavior—Canada. I. Title.
QL696.S8L96 2007
598.9’7097--dc22 2007014624
A catalog record for this book is available from the British Library.
The photograph of the ferruginous pygmy-owl on page 33 is by Brian E. Small; used with permission.
Frontispiece: The great horned owl is primarily a nocturnal hunter, but in the depths of a northern winter it will hunt in the half-light of dusk and dawn.
Special discounts are available for bulk purchases of this book. For more information, please contact Special Sales at 410-516-6936 or [email protected].
The Johns Hopkins University Press uses environmentally friendly book materials, including recycled text paper that is composed of at least 30 percent post-consumer waste, whenever possible. All of our book papers are acid-free, and our jackets and covers are printed on paper with recycled content.
For my wife, Aubrey, who always believed in me and for my owling buddy Dr. Gordon Court, a good friend
The large and powerful great horned owl
is the most common and widespread owl in the
United States and Canada.
CONTENTS
Acknowledgments
Introduction: Owl Addiction
CHAPTER 1 ANATOMY OF AN OWL
Paleocene Origins
WMDs: Weapons of Mouse Destruction
On Wings That Whisper
Colors that Disguise
Fretting with Feathers
CHAPTER 2 SON ET LUMIÈRE
Sound Advice
The Handicap of Darkness
The Eyes of Owls
The Nocturnal Syndrome
CHAPTER 3 HAUNTS AND HIDEAWAYS
From Tundra and Taiga to Mountains and Marshlands
Floaters
Hot and Cold Weather Woes
Roost Rewards
Fleeing from Winter
Owl Invasions
CHAPTER 4 THE OWLISH APPETITE
Foods That Fight Back
Pellet Diaries
Hunting Techniques
Hoarding for Hard Times
CHAPTER 5 FAMILY LIFE
Who Gives a Hoot?
Courtship Conduct
House Hunting
The Cloacal Kiss
Oology
The Tedium of Incubation
Sexual Dimorphism: The Great Debate
CHAPTER 6 THE NEXT GENERATION
Early Chick Life
Asynchronous Hatching: A Strategy
Life in the Nest
Roamers, Branchers, and Homebodies
The Young and the Restless
CHAPTER 7 PREDATORS, PIRATES, AND PESTS
Kleptoparasitism
A Call to Arms
CHAPTER 8 OWLS AND HUMANS
HIPPO
Appendix: Scientific Names of Plants and Animals
References
Index
Identification Guide follows page 24
ACKNOWLEDGMENTS
I would not have been able to produce this book without the friendly assistance, cooperation, and encouragement of many people. My sincere thanks go to owlers Graham Booth, Bruce and Bonnie Caywood, Ray Cromie, Jeff and Angela Gottfred, Al MacKeigan, and Trevor Roper. I am also indebted to many professional biologists who offered me valuable time with them in the field. I acknowledge Dr. Frederick and Nancy Gehlbach who taught me about tree cavities and desert owls, Sheridan Stone who introduced me to Arizona’s spotted owls, Dick Cannings who took me to see my first flammulated owls, Doug Collister who taught me how to whistle for northern pygmy-owls, and Rick Martin and Robert Sissons who showed me burrowing owls in Alberta. Discussions with other scientists gave me valuable insight into the world of owls, and I am thankful to the veteran owl researcher Denver Holt, bird banders Dr. Stuart Houston and Norman Smith, spotted owl biologist Kent Livezey, invertebrate biologists Drs. James Philips and Heather Proctor, raptor researcher Cindy Platt, and bird biologist Lisa Takats-Priestley, all of whom were enthusiastic, congenial, and helpful.
Professional photographers are notoriously secretive about where wildlife can be successfully photographed. Six of them were not and each gave me valuable tips where I could locate owls. My heartfelt thanks go out to Rick and Nora Bowers, Dr. Gordon Court, Bobby Harrison, Jared Hobbs, and Brian Small.
Two friends were especially important in bringing this book to fruition. The biologist Jared Hobbs is a great field person and a damn good photographer; his enthusiasm is contagious and his energy enviable. I greatly enjoyed our many trips together and thank him for tolerating his geezer
companion. The biologist Dr. Gordon Court has been a valued friend for more than a decade. Without his help this book would never have happened. His advice, encouragement, experience, and assistance in the field were more helpful that he can possibly imagine, and I treasure the many happy hours we spent together searching for owls and photographing them.
The Alberta Foundation for the Arts provided generous funding to help pay the bills while I buried myself in the library. I thank them for their support and belief in the project. I also thank the librarians at the University of Calgary and at the Calgary Public Library who tracked down obscure references for me.
Once the book was written, I surrendered the text to six brave souls for technical review. It is a daunting task to carefully read an entire manuscript with enough attention to make constructive criticisms, and I am grateful to my reviewers for finding the time to undertake this valuable yet onerous task. My thanks go out to the Alberta endangered species biologist and raptor specialist Dr. Gordon Court, author and research scientist Dr. James Duncan, researcher and professor of biology Dr. Frederick Gehlbach, senior government research scientist Dr. Geoff Holroyd, British professor of biology Dr. Graham Martin, and author and retired government research scientist Dr. Robert Nero. All were thorough and methodical in their reviews and insightful with their criticisms. I thank them all for their candor, attention to detail, and helpful suggestions. Of course, I alone accept all responsibility for any errors that may have crept into the text.
This is my first book with the Johns Hopkins University Press and I am thrilled to be working with such a prestigious publisher. The many people I met from various departments at the Press were encouraging and generous with their comments. I especially thank life science editor Dr. Vincent Burke, who devoted himself to the quality of this book. He skillfully and graciously guided me along, easing the process throughout. I found him to be knowledgeable, helpful, and creative. His professionalism was unmatched in my 27 years of working with editors. I am also thankful to the managing editor, Juliana McCarthy; copy editor, Anne R. Gibbons; and designer, Glen Burris, for their creative involvement.
Last, and most important, I thank my wife, Aubrey Lang, to whom this book, and every other book I’ve ever written, is dedicated. After 33 years of marriage I still find her the most stimulating, delightful, and unselfish person I have ever met. Her skill as an editor, her toughness as a field companion, and her creativity as a business partner are just three of the many reasons I love her dearly. She made the magic happen.
INTRODUCTION: Owl Addiction
Perhaps I was destined to write a book about owls. I have been a critter junkie since I was a child, and owls have been an important part of many significant events in my past. When I was 11, the chance discovery of a boreal owl roosting near my home in Ottawa, Ontario, greatly accelerated my interest in natural history. I felt I had been given a privileged glimpse of a mythical creature. This lucky sighting led me to my local library where I read all the owl books I could find. It wasn’t long before my interest in wildlife expanded to anything with a beating heart. Later, when I was a young man in medical school, it was a barred owl that launched my passionate pursuit of photography. One afternoon, during a break between lectures, I was gabbing with a classmate about the unwary barred owl that was wintering on the campus and how easily the secretive bird could be seen. A week later the classmate gave me an 8 × 10 inch glossy black-and-white closeup photograph of the owl as a thank you. Within days, I had bought my first camera, and the rest, as they say, is history.
An owl also played a role during the courtship of my wife. On one of our earliest dates, I took her to see an eastern screech-owl that I knew was roosting in the woods near her home. Aubrey, a sweet, charming, French Canadian, big-city girl,
had no idea such fascinating creatures of the night lived nearby and could be seen so easily as they warmed themselves in the midwinter sunshine. I later joked with her that an afternoon owl outing was a good way to minimize courtship expenses and also demonstrate what a sensitive guy I was. Thirty-three years later, we still chuckle about that afternoon, and the photographs I took on that cold January day are among my most treasured.
In September 1979, four years after we were married, I took a leap of faith and abandoned my career as an emergency physician to work as a freelance science writer and wildlife photographer. A book on the ecology of the prairie grasslands was to be my maiden voyage into the uncertain waters of my newly chosen career. With this first book I hoped to prove to family and friends that I wasn’t just a foolish nature nerd who had left a secure and lucrative profession for a vision that only I could see.
I began my grasslands project on a cattle ranch on the Saskatchewan-Montana border in the heart of what would become Canada’s Grasslands National Park. That summer, a pair of burrowing owls rescued me when I needed it most.
Near the ranch was a large black-tailed prairie dog colony, and several pairs of burrowing owls lived alongside the plump, tawny rodents. There was a drought that year and the skies were featureless and hazy, the prairie parched and brittle. I feared I had made a terrible mistake. Was I pursuing an impossible dream? I erected a canvas photo blind about 50 feet (15 m) from one of the nesting pairs of owls, and for several weeks I spent hours every day cramped inside, peeking at the world through a porthole and a camera lens. In the quiet solitude of that desiccated prairie, I frequently wavered in my resolve to alter the direction of my life. The owls, of course, were oblivious to my mental struggle, yet they unknowingly buoyed my spirits, time and again, with intimate glimpses into their private lives. I watched them gently preen each other’s face and neck, boldly scold and mob an American magpie, and hide in fear as the shadow of a golden eagle traced a course near their burrow. Sometimes, when I was hidden inside the blind I would simply rest my head in my hands and listen to the gentle coo of the owls and the soothing whisper of the wind in full conversation with the prairie. That summer, the owls were my salvation.
The boreal owl ranges the farthest north of any of the small owls in North America, extending to the boundary between the boreal forest and the arctic tundra at a latitude of 67° north in Alaska. (bottom) Of the 19 species of owls in the United States and Canada, the barred owl is one of 4 species with dark eyes. The other dark-eyed owls are the barn owl, flammulated owl, and spotted owl. All the other owls have yellow eyes.
A young burrowing owl may sometimes preen the feathers on its parents’ head and neck. It may also preen its nestmates.
In the 27 years that have passed since that first summer on the prairies, owls have repeatedly brought immeasurable joy to my life and left me with many cherished memories. One of those memories was the summer Aubrey and I camped alone in the Canadian High Arctic surrounded by herds of musk oxen, inquisitive arctic foxes, and courting king eiders to capture the regal beauty of nesting snowy owls. It was a summer I will never forget. In other parts of the world, owls were sometimes welcome surprises. In the grasslands of Brazil, while searching for giant anteaters, I was delighted every day to see burrowing owls perched atop innumerable termite mounds. In the legendary enchanted islands of the Galápagos archipelago, I was enthralled by the liquid flight of a short-eared owl boldly hunting wedge-rumped storm petrels in the waning light of dusk. In 2005, my love of wildlife led me to Trinidad, where I photographed magnificent leatherback sea turtles nesting at night on the moonlit tropical beaches and ferruginous pygmy-owls hunting in the sunlight and shadows of the rain forest during the day. In the mid-1800s, the American luminary Henry David Thoreau encapsulated my feelings when he penned these words: I rejoice that there are owls.
The long tail on the northern hawk owl gives the bird greater maneuverability in forested environments where it often hunts fast-flying songbirds. The hawk owl resembles the Accipiter hawks in its diurnal habits and hunting style.
I am not alone in my fascination with owls. Sightings of northern owls are on the wish list of many bird-watchers and nature enthusiasts. In a survey done in the 1990s by the highly respected American Birding Association, 3 northern owls, the secretive boreal owl, the ghostly great gray owl, and the rapacious northern hawk owl, were among the top 10 birds that members in the United States and Canada most wanted to see.
In 1997, when I attended the Second International Owl Symposium, one of the most entertaining presentations was one on owlaholics.
It seems that incurable owlaholics sleep on pillowcases embroidered with the images of owls, shower behind a bathroom curtain with owls peering in, keep their hand soap in an owl-shaped tray, dry their dishes with owl-embossed tea towels, use oven mitts with owls on them, and season their food with a requisite set of salt and pepper shakers molded in the shape of their favorite bird. Of course, they also wear clothing and jewelry, both tasteful and tacky, embellished with owlish designs and patterns. According to the presenter, the respected European owl expert Dr. Heimo Mikkola, there are thousands of owlaholics all over the world, but the majority live in the United States, England, and Australia. At that time, the United States topped the list with 109 International Owl Collectors Clubs, more than twice as many as either of its two rivals. Worldwide, only about 20 percent of owlaholics are males, but they own the largest collections, some with more than 5,000 owlish items. Apparently, people who work the graveyard shift, or stay up at night, are often the ones who become addicted to owls. Others become hooked after they inherit a collection and then begin to add to it. I wondered if anything had changed in 10 years so I went to eBay and typed in the word owl.
Up popped 7,196 items for sale, including earrings and brooches, ornamental boxes, key rings, letter openers, and figurines, even one carved from fossil mammoth ivory. For less than 25 dollars I could have bought my two favorite items: a set of owl-shaped golf club covers and a leather cell phone case. The latter seemed like a real bargain considering that the eyes of the owl adorning the case jiggled when you shook it.
Our attraction to owls begins at an early age. A first-grade teacher told me that owls are among the first birds that children learn to recognize. Owls, along with penguins, are the two most popular birds used to make stuffed toys. No doubt there are many things that endear us to owls, not the least of which are their solemn, seemingly contemplative demeanor, upright stance, large heads, and flat, oval faces. Owls also have exceptionally large eyes that are often bright yellow, making them all the more conspicuous. Anyone who has taken an introductory course in human psychology understands the primal reaction humans have to any animal with a relatively big head and large eyes. These are the juvenile traits common to many young animals, including human infants, and they elicit in us an innate tendency to nurture. In 1928, the legendary cartoonist Walt Disney understood this human reaction well and he used it to enhance the appeal of his trademark character Mickey Mouse. A normal house mouse has thin legs, small beady eyes, a long nose, and a relatively small head. When Mickey stepped off the drawing board he had short thick legs, large eyes, a big head, and a blunt snout. Over the years, Mickey’s juvenile traits have been exaggerated even further, presumably to make him more likeable.
Humankind’s interest in owls goes back a long time, perhaps since we first began to reflect on the world and the earthly forces that control and determine our fate. In Paleolithic Europe, Ice Age artists squeezed inside lightless caves with flaming torches and covered the walls with charcoal and ochre drawings depicting the wild animals that were important in their lives. Predators and prey were the most common creatures depicted. Some drawings may have been supplications for successful hunts, others a celebratory record of hunts that went well. Birds, in particular owls, are not a common subject in cave art. Until the early 1990s, a drawing, perhaps 15,000 to 20,000 years old, of a snowy owl and its chicks was thought to be the oldest bird species recognizable in prehistoric art. Found in a cave, Les Trois Frères (the Three Brothers), in Ariège, France, it was drawn at a time when France was covered by arctic tundra and much colder than it is today.
In 1994, one week before Christmas, three French speleologists found a limestone cave that made headlines around the world. The Chauvet Cave overlooks the Ardèche River in southern France, and its subterranean gallery of masterfully drawn lions, cave bears, ibex, bison, mammoths, and woolly rhinoceroses are now believed to be the oldest known paintings in the world, radiocarbon dated at between 30,000 and 32,000 years of age. On a rock overhang, the intrepid French trio found the solitary image of an owl. The painting, which has conspicuous ear-tufts and a heavily streaked breast, bears a strong resemblance to the Eurasian eagle owl—the largest owl in the world.
Owls appear in Egyptian hieroglyphics, on ancient Grecian coins, and on treasured Roman vases. Later, they adorned Byzantine sculptures, Renaissance silverware, and Victorian jewelry. In North America, owls and rock art have a much shorter history. The oldest owl depiction that I am aware of is believed to have been drawn by the Fremont Indians of southern Utah, between 800 and 1,500 years ago. The famous owl panel, located near the town of Moab, features a large bird about 2 feet (61 cm) tall, with oversized feet and long ear-tufts, most likely representing a great horned owl whose dangerous talons would have been widely recognized and respected by the native people.
Farther south, in Mexico, the Aztecs believed the owl was a potent symbol of the dark and mysterious underworld. During human sacrifices, stone containers, decorated with the images of owls, were used by the priests to hold the still-beating hearts of their unfortunate victims. As part of the sanguineous ceremonies, a shaman set the tempo by beating a drum on which the face of an owl had been carved.
Since the dawn of recorded history, the owl has been a powerful symbol for humans. In 77 AD, Pliny the Elder, the Roman statesman and scholar, wrote that the owl was the very monster of the night … when it appears it foretells nothing but evil.
The superstitious Pliny believed that this malevolent creature also possessed potent curative and magical powers. His remedy for an earache was a slurry of owl’s brain mixed with oil, then injected into the ear canal. If you were afflicted with rheumatism, ingesting the ashes of a burnt owl feather would bring certain relief. He also claimed that the heart or eye of an owl was the most reliable way to discover a secret. If you placed the magic body part on a person’s chest while he or she slept, upon awakening the person would disclose all his or her deepest secrets, especially those relating to infidelity and treachery.
The human imagination has always been fertile ground for myths and fabrications. We long to understand the unexplained and control the uncontrollable. The world around us is often beset with puzzling tragedies and disasters. Over the ages, humankind plumbed the depths of its collective imagination and repeatedly invented omnipotent celestial powers that could be worshipped and placated. With supplication, prayer, and complicated rituals, we strove to please the powers that we believed determined our fate, curry their favor, and perhaps regain control to alter our destiny. This prospect for control is the essence of hope, and it has always been a powerful force that could rescue us from despair. So it is with all myths; they are humanity’s desperate need to understand, explain, and control.
The Eurasian eagle owl is the heaviest owl in the world. Females from Norway can weigh up to 9.25 pounds (4,196 gm), almost twice the maximum weight of an adult female snowy owl, which is the heaviest owl in North America.
In the mortal mind, death and darkness have often been linked. Not surprisingly then, the owl, which for many is the consummate bird of darkness, was frequently considered a messenger of tragedy and doom. It is said that the death of the great Roman emperor Julius Caesar was foretold by the hooting of an owl. During the Middle Ages in Europe, the owl was thought to be an accomplice of sorcerers and witches, assisting these villainous souls in casting their evil spells. In later times, the owl could protect you from evil. If you nailed a dead owl over your front door it would ward off dreaded diseases. Kill a second owl and hang its lifeless body on your barn to guard your property and crops against damage from torrential rains, hail, and lightning fires. In keeping with its association with evil, the French name for the barn owl is effraie, which comes from the verb effrayer, meaning to frighten, or fill with dread.
The Haida culture of southeastern Alaska and coastal British Columbia sometimes carved the image of the spotted owl on their ceremonial totem poles because the bird had special meaning in their world.
In North America, the owl had an equally prominent place in the myths and beliefs of the indigenous peoples, and the birds were often associated with magic. The Cherokee Indians of the southern Appalachian Mountains would bathe a newborn baby’s eyes with water in which an owl’s feather had been soaked to improve the child’s night vision. The Seminoles of Florida would whistle when they heard the call of a barred owl. It was good luck if the owl answered back, a bad omen if it didn’t. Shamans in the Haida culture of coastal British Columbia wore amulets made from the remains of owls or elaborate masks fashioned from their feathers.
In the New World, as in the Old World, the owl was cast, at various times, as a messenger from the afterworld, the vengeful soul of a dead warrior, the bearer of bad news, a wicked servant of the deceased, or a feathered witch who could forecast the weather, warn of death, or kidnap naughty children. The Kiowa of the southern Great Plains thought powerful shamans were transformed into owls when they died. The Pueblo Indians of Arizona and New Mexico associated the owl with Skeleton Man, the god of death, and the fearsome Apaches whose famous warrior chiefs included Cochise and Geronimo, feared the owl more than any other creature in their world.
In my first year of medical practice, I worked in a small community in northern Ontario and many of my patients were Ojibwa people. A woman elder who had fallen and broken her arm told me she was not surprised by the accident. She believed that owls brought a person bad luck and the previous day she had accidentally flushed an owl in the forest.
Native peoples were often astute observers of the natural world with an intimate knowledge of animal behavior. Many admired the owl’s courageous defense of its young and its ability to attack swiftly and silently in the blackness of the night. The Tlingit people of the Pacific coast appealed to the spirit of the owl to give them courage in warfare, and they would rush into battle hooting like owls. The Oglala Sioux of the northern Great Plains revered the large, powerful snowy owl above all other birds of prey. Warriors who had fought well in combat wore a headdress of the owl’s feathers as a conspicuous badge of their bravery.
The owl has been credited with a greater breadth of character traits and powers than any other bird in history. By some it was worshipped; by others, feared and hated. Although owls were perceived by many as denizens of darkness, the native Hawaiians had great affection for the short-eared owl, the only species native to the archipelago, and they saw it as a protector.
In modern North America, the owl’s reputation has undergone a transformation better than any publicist could orchestrate. From the black depths of witchery and wickedness, owls have risen to become the most beloved group of birds on the continent. None have embraced them more than the community of Cape Coral in southwest Florida, which has a burrowing owl as its municipal mascot. Roughly 2,000 of these endearing diminutive owls live in the city and surrounding