An animal is a living organism that belongs to the kingdom Animalia. Animals are typically characterized by their ability to move, consume organic material for energy, and reproduce sexually or asexually. They can be found in various environments, from oceans to forests, and they play essential roles in ecosystems. Animals are classified into different groups, including mammals, birds, reptiles, amphibians, and fish. Each group has unique features and adaptations that help them survive in their habitats. For example, mammals usually have fur or hair and give live birth, while birds have feathers and lay eggs.