Pigeon

Pigeons were a species of bird native to the planet Earth. In 1943, pigeons were used to test a new chemical weapon planned for use in destroying Russia government after World War II ended. (DW: The Curse of Fenric)

The First Doctor declared that he had "the directional instinct of a homing pigeon."

Barbara Wright and Ian Chesterton encountered a large flock of pigeons in Trafalgar Square. (DW: The Chase)

Anji Kapoor deduced she was not in London as there were no pigeons. (EDA: EarthWorld)

Frobisher once took on the form of a pigeon but found himself attacked by an owl. (DWM: The Shape Shifter)