Black birds. Good or bad ... Starlings have rather stubby tails and yellow beaks in summer. They are communal nesters — wherever they can find holes and crevices in buildings.

These are the flashiest, most specialized beaks around. The black skimmer has a truly unique bill among shorebirds, and really, among all North American birds. The beak is large yet very thin ...

A firm favourite amongst Australian bird watches, the yellow-tailed black-cockatoo (Calyptorhynchus funereus ... Cockatoo chicks are covered in yellow down, with a pink beak that fades to greyish ...

While many birds have basic brown or black bills ... nicknamed “the clown of the sea,” has a stunning beak that turns bright orange, yellow, and blue during the breeding season.

But he and his colleagues have discovered some truly fascinating clues that a bird called the great tit may be evolving longer beaks to access ... of great tits, a yellow-and-black songbird ...

They further found that the enzyme was expressed in almost undetectable levels in the birds' yellow beaks. The genetic findings pave the way for new kinds of studies on the red coloration of birds ...