Symmetry is a way to classify different types of animals. All animals except sponges have radial or bilateral symmetry. Unlike animals with radial symmetry, animals with bilateral symmetry are only able to be divided equally one way. Radially symmetric animals commonly have a mouth in the center of their bodies.
Most animals are bilaterally symmetric. Humans, birds and fish all have bilateral symmetry. Sponges are the only animals that are asymmetric, meaning they have no symmetry.Learn more about Shapes