Crocodile

Crocodiles were a species of reptile.

In ancient Egypt, Thoueris was capable of controlling the crocodiles in the River Nile with her ring. The Doctor took her ring and used it to turn the crocodiles against her. (DWM: The Power of Thoueris!)

In 1947 India, a gigantic crocodile attempted to attack the Campbells' house, but Major Daker shot it dead. (NSA: Ghosts of India)

On an unnamed planet, the Doctor was nearly attacked by a crocodile, but succeeded in driving it off. (TVC: The Didus Expedition)

One planet was inhabited by six-legged, telepathic crocodiles. (DWA: The Crocodiles from the Mist)