Alligator
From Tardis Wiki, the free Doctor Who reference
Biology
Alligators are similar to crocodiles in appearance; they have hard scaly skin and large jaws.
History
During the Dalek Invasion of Earth, many animals escaped from zoos due to the people getting the plague. Many animals died but reptiles such as the Alligators thrived in the sewers. An Alligator almost ate Susan but was killed by David Campbell.
