Hermit crabs that live on land have remnants from when they were in the water, and breathe through their gills and abdominal skin. They can only breathe in moist places.

The octopus has one brain in the center of its body and a small brain in each of its eight arms. By the way, there are three hearts.

Common bottlenose dolphin can swim at speeds of 30-40 km/h and Pacific white-sided dolphins can swim at speeds of 50 km/h.

Fur seals are divided into two species: northern fur seals and southern fur seals.
There is one species of northern fur seal and eight species of southern fur seal.

It is the only species of penguin that lives in Africa.