Queen bat

Queen bats were large, hairy bat-like creatures that lived in the caves of Androzani Minor.

Biology
They had a three year life cycle, some of which was spent in a chrysalis. These chrysalises had a large supply of unrefined spectrox, which was refined and used by the humans of Androzani Major. (TV: The Caves of Androzani)

History
The bats were killed or driven out by the mining androids, which caused them to move into the airless caves deep underground to die. With use of a half empty tank of oxygen the Fifth Doctor had to climb down deep in the caves to obtain some Bat's milk to cure himself and Peri who had contracted Spectrox toxaemia Sadly the Doctor only managed to milk enough for Peri. As Peri came round the Doctor was in the late stages of the disease and Regenerated as a result. (TV: The Caves of Androzani)