Animals Notes 1.2 Animal Symmetry The Mathematics of Symmetry The bodies of many animals exhibit symmetry, meaning they have a balanced arrangement of parts. Three basic types of symmetry… 1) Bilateral Symmetry-The body can only be divided into two halves that look like a mirror image of one another. Example: humans 2) Radial Symmetry-There are many lines of symmetry, all of which pass through a central point. Example: starfish 3) Asymmetrical-There are no lines of symmetry Example: Amoeba Symmetry & Daily Life ` Animals with Radial Symmetry -These animals do not have distinct front and back ends. -All live in water. -Most do not move very fast. Animals with Bilateral Symmetry -These animals have distinct front and back ends. -Bodies are streamlined allowing for quick movement. -Sense organs are usually located on the front end.