A living organism that is not a plant. Animals are usually multicellular, have a nervous system, and are able to move around. They typically obtain energy by consuming other organisms.
Animals are classified into different groups based on their characteristics. The main groups of animals are:
* Invertebrates: Animals that do not have a backbone. This group includes insects, spiders, worms, and crustaceans.
* Vertebrates: Animals that have a backbone. This group includes fish, amphibians, reptiles, birds, and mammals.
Animals play an important role in the environment. They help to pollinate plants, disperse seeds, and control the population of other animals. Animals are also a source of food, clothing, and shelter for humans.