A few species eat insects. The bones of these and other flight birds are hollow, which makes flying easier because less weight has to be lifted. The inside of the bones have struts for strength. The bulbuls wings are short and rounded. This makes flying a bit harder, so few birds of this species migrate.
Bulbuls build their nests in the forks of trees or bushes.
The nests are built of materials such as twigs, leaves, spider's webs, and other materials and lined with grass. As you can now see from this report, penguins are very different from flight birds. Resources The Encyclopedia of Birds Birds, Their Life, Their Ways, Their World Return to Adamz Hoemwurk Paij .