Explained: How do India's different states choose their state animals?

How did the Nilgai get selected as Delhi's state animal? How do states choose their state animals? Read here

If you have been to the Jawaharlal Nehru University Campus, you are sure to have spotted a strange beast somewhere halfway between a cow and a deer. You’ll also find it at the Delhi ridge. This is the Nilgai, also known as Boselaphus tragocamelus, and till not too long ago, the state animal of New Delhi. The Nilgai however is set to lose its status as Delhi’s state animal. The Delhi Forest Department has said that while Delhi has a state bird, the House Sparrow, no document is available on declaring the state animal and tree as per official records.