Researching for his latest volume, this top bird expert became convinced of something he had not previously anticipated: Birds routinely make complex decisions — and experience emotions.
Sibley's main aim is to ignite appreciation of the varied North American birds we may encounter in our backyards and nearby parks. Owing to the COVID-19 pandemic, right now many of us yearn for greater connection to nature close to home, socouldn't be more perfect. The volume's organization —"each essay focuses on one particular detail of bird biology"—means it's equally rewarding to dip in here or there, or just read straight through.
Size, color and behavioral habits all aid bird-watchers in distinguishing among species. I have managed to live for six decades as an animal lover without realizing that most one-month-old birds are fully grown:"A smaller bird at your bird feeder is not a baby, it is a different species." Usually males are just a little larger than females, although in hawks, owls, and hummingbirds females are substantially bigger. That extra body mass might aid females' warming their eggs and young chicks, whereas males' greater agility might result in efficient grabbing of small prey used to provision females during incubation.
The nature of parental care in birds varies tremendously. Baby songbirds, like swallows, hatch naked with eyes closed, and require intense feeding and care. By contrast, the chicks of loons —"iconic symbols of the clean northern lakes they require for nesting" — swim the same day they hatch. By three weeks of age, the babies can pursue fish with hundred-foot-underwater dives.
Across species, males and females may vary in color; colors may change across the life cycle; and even between seasons birds may look entirely different. The vibrant yellow of a male goldfinch in summer is iconic, but would we recognize the same bird appearing entirely drab in winter? Across several essays, Sibley delves into the"how" of bird coloration.
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