Lizard

Lizards were a type of reptile with tympanic membranes close to the skin. (COMIC: Ripper's Curse)

In the 1970s, Professor Tansbury's experiment resulted in the creation of a giant lizard. (COMIC: The Tansbury Experiment)

On Uxarieus in 2472, the IMC tried to drive off the the colonists living there by using a robot and projections to make it appear that giant lizards were attacking. (TV: Colony in Space)

The First Doctor, John and Gillian visited an unnamed planet inhabited by giant lizards which briefly captured them. (COMIC: Lizardworld)

The Seventh Doctor briefly turned Chris Cwej into a lizard. (PROSE: Sky Pirates!)

While scanning space for Cyber-Warships, the Seventh Doctor spotted a lizard coming out from hiding and realised the ships were camouflaged. (TV: Silver Nemesis)