Turtle

Turtles were a type of reptile.

The Eighth Doctor once materialised the TARDIS on the back of a giant prehistoric turtle. (BFA: Absolution)

Bernice Summerfield kept two turtles as pets while living in isolation. (BFA: The Shadow of the Scourge)

Life forms which seemed to be descended from turtles or turtle-like creatures included Sea Devils, Chelonians, and Jixen. (DW: The Sea Devils, NA: The Highest Science, K9TV: Regeneration)

Behind the scenes
While filming Planet of Fire in Lanzarote, Dallas Adams and Peter Wyngarde took some turtles from a hotel pool and released them into the sea, causing the police to be summoned.