Bird

A bird was a type of animal found on Earth and many other planets.

Birdie was named after his fondness for birds. (TV: Mutant Copper)

Birds were used by humans to study the effect of certain chemicals, as in the case of their use to test a new chemical weapon in 1943. (TV: The Curse of Fenric)

In 2013, the increased radiation, spread of silicon quartz in the water and the decline of local fish life resulted in the death of local bird populations, such as gannets, gulls and puffins. (AUDIO: Eldrad Must Die!)

Types of birds on Earth
Types of birds native to Earth included:

Beyond Earth
The First Doctor, John and Gillian visited an Earth-like planet inhabited by giant birds which briefly captured them, but they escaped with the aid of an ugly animal. (COMIC: Kingdom of the Animals)

The Galyari revered birds. The Sixth Doctor used their birds to defeat Voshkar. (AUDIO: The Sandman)

The planet Pheros was inhabited by intelligent metal birds. (TV: The Infinite Quest) The devil-birds of Corbo were robots designed to resemble birds. (PROSE: The Devil-Birds of Corbo)