They are Multi-cellular living organisms that are developed around 500 million years ago from single-cell marine organisms. The body shape of the animal is fixed once it reaches maturity but some species under metamorphosis. Animals are able to move, and they ingest other organisms for their survival. There are over one million of identified species that include insects, reptiles, birds, fish, and mammals.
The birds, fishes, mammals, insects, reptiles, etc. are the example grouping of Animals defined in biology science. Examples of commonly found animals around humans are Dog, Cat, Horse, Cow, Chicken, Pig, Duck, Sheep, Goat, Turkey, Rabit, Ant, Spider, and many more.