Sibley Guides

The breastband of Common Ringed Plover may or may not be thicker than Semipalmated, but it always extends farther forward onto the throat, and the difference is most obvious in flight!

A new wall calendar using 16 of the full-page images from my book What It’s Like to be a Bird is now on sale.

I no longer sell books directly through this website, so I can’t personalize books for you, but now I am pleased to offer signed bookplates at no cost as an alternative.

Male and female Chipping Sparrow are not exactly alike, and when viewing a mated pair the differences are usually clear.

Looking at the different bill shapes of male and female American Avocet reveals other differences.

To separate Roseate Tern from the other expected species of terns just look at the upper margin of the folded wingtip (the inner edges of the primaries).

Summary – A bird in sagebrush habitat showing features of Timberline (taverneri) Brewer’s Sparrow provides an opportunity to review the distinguishing features, and raises questions about range, variation, and taxonomic status.

Detailing my new discovery that male and female Eastern Kingbirds are reliably distinguished by head shape – with the male having a more triangular head.

The Sibley Guide to Birds was published in 2000 – twenty-six years ago!

Following up on my earlier post about structural differences, here is a discussion about plumage differences between Mangrove and Northern Yellow Warblers.