Rabbit

A rabbit was a small mammal. On Earth, they were so prized for their meat that they could inspire poaching, as certainly happened in England around the time of the Great Fire of London. (DW: The Visitation)

They could also be held as pets. The Fifth Doctor, Nyssa and Tegan once met a boy named Rithros who had lost his pet rabbit. The Doctor was able to use 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. (DWA: 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)