A bird beak is the most important resource it has ... and shut in less than a hundredth of a second. Large raptors, like red-tailed hawks, bald eagles and great horned owls, survive on prey ...

The beaks of albatrosses and penguins, compared to other, “normal” beaks (examples shown of a petrel and a gull) and a bird with a tactile ... and the red struictures on the right show the ...

Females prefer beaks that are redder. Males use the red-orange colouration as a way ... caused by how well the light-sensitive cells in the bird's eyes distinguish difference wavelengths of ...