Millions of different types of animal live on Earth. Each kind of animals is known as a species. Whether they are as tiny as an ant or as big as an elephant, all animals have a few things in common. For example, animals must eat other living things to survive, unlike plants, which get their energy from sunlight. Animals can also move from pace to place, whereas plants cannot. There are characteristics by which we recognize animals — they are multicellular, get the energy necessary for life by eating other organisms, and can move and sense their environment. Animals are a group of organisms in the family Animalia. Animals can be insects, mammals, reptiles, fish, and other organisms that are not plants. In agriculture, animals are raised for food, fiber, and fuel. These animals are known as livestock. Companion animals are what we call dogs, cats and other animals that provide companionship to humans.
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