👉My favourite animal is lion. 👉My favourite animal is the lion. Here “the” is used to emphasize the word “lion”. These both are correct.

-My favorite animal is a lion? - Grammatically correct, but you would only use it to mean there is one specific lion who is your favorite animal. ex: My favorite animal is a Lion. He lives at the zoo and his name is Bob. -My favorite animal is lions? - wrong, due to unmatched plural and singular. -My favorite animal is the lion? - correct, and the most natural/common of the choices. -My favorite animal are lions? - incorrect. Just add an S so animal, and it would be okay.

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I would say: My favourite animal is the rabbit. Or more likely My favourite animals are rabbits.

My favorite animal is a lion