Bat

Bats were nocturnal, flying mammals found on Earth. They were feared by some humans who believed that they drank blood. However few species of bats actually did so.

Many Vampire legends tell of Vampires turning themselves into bats and back into their true forms.

Florence Stoker had the ability to control bats and used them to block the sunlight, allowing her to go outside during the day. (DWAM: Bat Attack!)

At one point, bats lived in the Cloister Room of the Doctor's TARDIS. (DW: Doctor Who) Their names were Jasper and Stewart. (EDA: Vampire Science, Seeing I)

Aukon used bats as servants in his kingdom. He sent them to attack the Fourth Doctor and Romana. The Doctor claimed they were harmless shortly before he was bitten. They traveled in a flock of many thousands. Later, Romana was also bitten by a bat while in a trance. (DW: State of Decay)

One species of bat was native to Androzani Minor. (DW: The Caves of Androzani)

The Screamers were bat-like creatures native to Desperus. (DW: The Daleks' Master Plan)

The Tetraps resembled bats, and they also slept upside down just like bats. (DW: Time and the Rani)

The First Doctor, John and Gillian briefly encountered a bat in a cave on a desolate planet. (TVC: Shark Bait)

The natives of Bessan had bat-like wings, when they were conquered by the Krillitanes, who added them to their physiology. This new type of Krillitane resembled humanoids bats. Like the Tetraps, they also slept upside down like bats. They also had very sensitive hearing. (DW: School Reunion)