Become a member and get exclusive access to articles, contests and more!
Start Your Free Trial

What to look for as birds molt their worn-out feathers

Here are two views of the sixth primary of a Ring-billed Gull. It’s freshly grown in the fall (upper) and very worn in the late summer of the following year (lower). Art by David Sibley
Late summer is the time of year when many birds replace their feathers in a process called molt. Old feathers, most of which have been worn for about a year, fall out, and new feathers grow in their place. Gulls, for example, molt their wing feathers only once a year, and we generally don’t notice … Read More "What to look for as birds molt their worn-out feathers"
To access this content, you must purchase BirdWatching Membership.

Read our newsletter!

Sign up for our free e-newsletter to receive news, photos of birds, attracting and ID tips, and more delivered to your inbox.

Sign Up for Free
David Sibley

David Sibley

David Sibley writes the column “ID Toolkit” in every issue of BirdWatching. He published the Sibley Guide to Birds in 2000, the Sibley Guide to Bird Life and Behavior in 2001, and Sibley’s Birding Basics in 2002. He is also the author of the Sibley Guide to Trees (2009), the Sibley Guide to Birds-Second Edition (2014), guides to birds of eastern and western North America (2016), and What It’s Like to Be a Bird (2020). He is the recipient of the American Birding Association’s Roger Tory Peterson Award for lifetime achievement in promoting the cause of birding and a recognition award from the National Wildlife Refuge System for his support of bird conservation.

David Sibley on social media