A Baltimore oriole nest made of mostly horse hair, and only horse hair, is the best bird nest I have ever seen. It was found in a tree in the yard of a friend. Alex, who showed me the nest, lives on ...

Some of those pictured are built primarily using dry grass, like that of the spectacled longbill (main picture), the only known research specimen, and the opened-up “ball” nest of the desert cisticola ...