The lips on their wide mouths looked hard, beaklike, adding to the impression that these things were somehow in the bird family.

The shape of these bones varies across the bird families.

As with other bird families, pelicans are susceptible to a variety of parasites.

This group is among those Old World bird families with the highest number of species still being discovered.

He also developed a lifelong interest in two distinctly different bird families, the hummingbirds and the petrels.

They have to find each other with the help of the other bird families.

This species has been placed in several bird families since its description.

This is one of only three bird families restricted to the Oriental zoogeographical region.

The rails are a bird family comprising nearly 150 species.

He wrote a series of books on bird families.