Some of the animals that start with the letter I include ibises, iguanas, ibexes and Indian giant squirrels. Insects are also animals. They are actually the most diverse class of animals, and over one million different species have been identified.
Another animal that begins with the letter I is the impala, which is a medium-sized African antelope. Other animals that share the same beginning letter include the Indian jackal, Indian leopard, Indian mynah, Indian peacock, Indian porcupine, Indian red admiral, Indian star tortoise, and Indian treepie, which is a small bird that is native to parts of Southeast Asia.