David Sibley's ID Toolkit - Page 5 of 5

David Sibley explains how a bird can change its appearance by rearranging its feathers

By David Sibley
Updated October 4, 2018

Feather color accounts for most of the variation that we see in the appearance of birds, since color fluctuates with age, sex, and other factors, … Read More

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David Sibley explains how to use nesting behavior to help identify birds

By David Sibley
Updated October 4, 2018

In most of North America, nesting behavior is common any time between April and July. You may not think of it as a field mark, … Read More

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David Sibley explains how birds that really want to be noticed use visual signals as well as song

By David Sibley
Updated October 4, 2018

Identifying birds is really about understanding birds. Being attuned to the basics of bird behavior can help us put a name on species. Spring is … Read More

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David Sibley explains what to look for the next time you see a partial albino bird

By David Sibley
Updated October 4, 2018

Sooner or later everyone who watches birds will come across a real oddball. Some of the more frequently seen abnormal birds are the partial albinos. … Read More

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