Earthworm

Worms were a species of invertebrate.

In 1964, DN6 was tested in Forester's garden, killing a worm along with all the other animal life. The Doctor and Barbara Wright later discovered the dead worm. (DW: Planet of Giants)

Brock offered the Doctor and Frobisher a worm. Frobisher accepted but felt ill after eating it. (DWM: Once Upon a Time Lord)