What Are the Advantages of Bilateral Symmetry in Animals?

By Staff WriterLast Updated May 27, 2020 7:47:56 PM ET

While scientists are still trying to determine the different ways that bilateral symmetry in animals is advantageous, the most obvious benefit is that it enhances an animal’s mobility. It allows fluid movement in a particular direction, which helps when an animal is searching for food or trying to escape danger.


All vertebrates have bilateral symmetry as well as some invertebrates. Bilateral symmetry refers to both sides of the body being a mirror image of each other when viewed across a central axis. On either side of the central axis, the arrangement of an animal’s body parts is the same. This only applies to the body shape, not the internal organs.