Birds

Bird eggs are so diverse, so which are the largest and smallest, and how do they get their colors?

Birds do produce urine, but it doesn't come out the same way it does in humans. How birds pee may be an evolutionary adaptation that benefits flight.

In a series of new experiments, Goffin's cockatoos were able to use a set of different tools to complete complex tasks. The brainy birds can decide which gadget works best and carry their varied equipment around with them.

Researchers in New Zealand have unearthed fossils from two previously unknown ancient penguin species. One of the new species is the largest penguin ever discovered.

Satellite photos showing poop stains in the West Antarctic snow and ice have revealed a previously unknown breeding colony of emperor penguins.

A new study has revealed that red junglefowl, the wild ancestors of chickens, are losing their genetic diversity as they mate with their domesticated counterparts.

A fossil skull from a toothy early relative of today's birds shows a weirdly modern skull configuration, raising new questions about the early evolution of birds.

Images and footage of the black-naped pheasant-pigeon were recently captured by scientists. This is the first documented sighting of the elusive bird since 1882.

In cognitive tests for recognizing certain types of patterns, crows outperformed monkeys.