Q: Why do cats make terrible storytellers?
A: They only have one tail!
Explanation: A tale is a story. If you are a teller of tales you are a storyteller.
A tail is the part of of an animal that located at its rear end. Most animals, such as cats and dogs, have tails.
This joke is funny because it plays with the words tale and tail which sound the same. Tale and tail are homophones because they sound the same but have different meanings and different spellings.
Watch here to understand cats better: