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June 14, 2018 — The glittering, colorful feathers on the throats of male hummingbirds help them attract mates and defend territory. Here's how they work, up-close.

June 11, 2018 — Most birds lay a predictable number of eggs, but why?

June 06, 2018 — It can be tempting to interfere with these brood parasites. But there are many reasons—legal and behavioral—to leave tampering to the pros.

June 05, 2018 — An extra-hard shell gives each egg a better chance of making it through a bulbul's gut—and hatching on the other side.

May 25, 2018 — A unique experiment aims to lure Kirtland's Warblers to habitat hundreds of miles away from their typical haunts. It's working better than expected.

May 24, 2018 — Today’s great diversity of tree-dwelling birds can be traced back to small ground birds that survived global forest destruction.

May 23, 2018 — Using 3D-printed "cuckoo" eggs, researchers found that native birds will be in big trouble if the foreign nest parasites ever colonize.

May 18, 2018 — New research shows that many North American songbirds log extra miles to refresh their feathers before migrating.

May 15, 2018 — A history of glaciers and warm spells has turned the region into a special place where species and subspecies mate.

April 30, 2018 — Such behavior had been unheard of in Great Horned Owls—until a live cam captured this atypical family.