Crow

A crow in 2nd century Scotland. (TV: The Eaters of Light)

Crows were an Earth species of bird, described by the Fifth Doctor as "harbingers of doom". While crows were scavengers by nature, feeding on fresh meat such as road-kill killed by others, they did occasionally kill by themselves, although this usually only extended to field mice. (AUDIO: Plague of the Daleks, TV: The Day of the Clown)

A group of artificial Dalek-controlled crows mysteriously observed the Fifth Doctor and Nyssa when they arrived in 45th century Stockbridge. (AUDIO: Plague of the Daleks)

In 1890, Vincent van Gogh painted crows soaring through the sky above a wheat field; this was one of his final paintings. (TV: Vincent and the Doctor)

During the 2nd century, crows were able to talk to humans by repeating their phrases as well as a few words usually based on what's to come in the future. When Kar sacrificed herself to be a keeper of the gate, her brother Ban told the crows her name. As a result, the cawing sound by the crows turn out to be them remembering her name. (TV: The Eaters of Light)