The Tyrannosaur Doe is a female Tyrannosaurus rex that appears in The Lost World: Jurassic Park and the original 1995 novel. She is the mate of the Tyrannosaur Buck and mother of Junior. She can be differentiated from her mate in that she is a brown colour and has less pronounced brows. The name "Tyrannosaur Doe" is not an official name, but since her mate is called the "Buck", then she must be a Doe, just like a female deer.