Piranhas are fish and, like all fish and other vertebrates, have bilateral symmetry. This means they have symmetry across one plane (known as the sagittal plane, and directly down the centre of their body), which means one side of their body approximately mirrors the other side.
Piranhas don't do anything in the way of nests or homes.
One type of symmetry is rotation. The second type of symmetry is translation. The third type of symmetry is reflection.
carnivore
Bilateral Symmetry
Bilateral symmetry
Arial symmetry
Bilateral symmetry.
Bilateral Symmetry
Arial symmetry
Bilateral symmetry.
Radial Symmetry