EVELYN: We’re on the Galápagos Islands! And that is a Galápagos tortoise!

DOCTOR: Well actually, Galápagos is a Spanish word for tortoise.

EVELYN: Oh?

DOCTOR: They named the islands after them, you see. The Tortoise Islands, which I suppose means that that is, in fact, a tortoise tortoise! And that’s something else I’ve tort-oise.

DARWIN: I believe in descent through modification!

DOCTOR: Yes, Charles!

DARWIN: I believe in natural selection!

DOCTOR: Yes!

SILURIAN TULOK: It is no good, Doctor. You cannot fight me.