These beaks allow the birds to reach insects that are hidden ... These are comb-like structures along the edges of the bill that act as filters. Lamellae allow waterfowl to strain food particles ...

“normal” beaks (examples shown of a petrel and a gull) and a bird with a tactile bill-tip organ (a tinamou, close relative of ostriches and emus and which has an ancestral bill-tip organ ...

Its hooked beak is all raptor. Birds are no less diverse behaviorally ... Unlike instinctual calls, the extravagantly complex pitch, rhythm, and structure of true birdsongs must be learned ...

Under these drastically changing conditions, the struggle to survive favored the larger birds with deep, strong beaks for opening the hard seeds. Smaller finches with less-powerful beaks perished.

Later, he wrote: 'Seeing this gradation and diversity of structure in one small ... and body size but the most obvious differences between the birds are the size and shape of their beaks, which are ...

Birds have feathers and a beak and lay hard-shelled eggs. Many birds are able to fly using their wings, but others such as ostriches are flightless and unable to fly. Some birds like penguins ...

Birds have a unique digestive system that allows them to eat when they can—usually on the fly—and digest later. They use their beaks to grab and swallow food. Even the way a bird reproduces is ...

Yet birds differ from their reptile ancestors in many important ways. A turning point in their evolution was the development of larger brains, which in turn led to changes in the size and shape of ...

Living bird species also have no teeth, although some species – often aquatic ones – have ridges on their beaks. These may function similarly to simple teeth by helping the birds to hold on to ...