Rabbit

A rabbit was a small mammal. On Earth, they were so prized for their meat they inspired poaching, at least in England around the time of the Great Fire of London. (DW: The Visitation)

Clements, the poacher who worked the grounds of Marcus Scarman's house, caught a rabbit shortly before spotting a robot mummy removing itself from one of his traps. (DW: Pyramids of Mars)

Rabbits were also kept as pets. The Fifth Doctor, Nyssa and Tegan once met a boy named Rithros who had lost his pet rabbit. The Doctor used his celery stick to lure the animal back to his master. (ST: Goths and Robbers)

The Fourth Doctor once asked K9 if he wanted to chase some rabbits. Adric had to explain to him that this meant they were going somewhere. (DWAN: Inter-Galactic Cat)

Boa constrictors preyed on rabbits and ate them whole. (DW: The Time Monster)

A giant rabbit was a delegate at the Third Inter-Galactic Peace Conference. (DW: Frontier in Space)

"Rabbits" was a favourite swear word of Tegan Jovanka. (DW: Logopolis, etc.)

On Dagomere, giant rabbits were known to dig large tunnels. (BFBS: The Tree of Life)

While trapped in an Alice in Wonderland-inspired reality, one of the characters encountered by Peri Brown was a version of the story's White Rabbit who strongly resembled the Sixth Doctor. (DWM: Salad Daze)