Artist, naturalist and writer Julie Zickefoose will present “Baby Birds: An Artist Looks into the Nest” at 7 p.m. Sept. 29, the opening day of the third annual American Birding Expo taking place at the Greater Philadelphia Expo Center, 100 Station Ave., Oaks, Pennsylvania.

A scientist’s relentless curiosity joins the artist’s quest for beauty in this presentation based on a 13-year, day-by-day study that documented the nestlings of 17 bird species as they progressed from hatching to fledging, in some cases as quickly as 11 days.

The American Birding Expo is sponsored by Bird Watcher’s Digest in association with the American Birding Association and Audubon Pennsylvania.