Whale

Whales were a group of Earth marine-mammals. They ate krill.

The Doctor's TARDIS took on the shape of a Whale, both internally and externally, when Nyssa repaired the chameleon circuit. By projecting the Doctor's heartbeat, they were able to entice Whales in. (ST: The Deep)

Star Whales were variant space-born Whales. (DW: The Beast Below)