What do all animals have in common? What makes an animal an animal?
- Animals cannot make their own food. Some animals eat plants to supply their energy needs, some animals eat other animals, and some eat both plants and animals.
- Animals digest their food, large food particles are broken down into smaller substances that their can use.
- Most animals can move from place to place. They move to find food, shelter and mates and to escape from predators.
- Animals are many celled organisms that are made of many different kinds of cells. These cells digest food, get rid of wastes, and reproduce.
- Animal cells are eukaryotic cells.
Animal Classification: Scientists place all animals into smaller related groups. They begin by separating animals into two distinct groups – vertebrates and invertebrates. Vertebrates are animals that have a backbone; invertebrates are animals that do not have a backbone. There are far more invertebrates that vertebrates. About 97 percent of all animals are invertebrates.