Members of the toothed " Toothed whale" family, such as the Common bottlenose dolphin and Pacific white-sided dolphin, have almost completely lost their olfactory structures, such as the nerves that sense smell.
This is because dolphins live in water and do not need it during the evolutionary process.

Once a year, the old hair on the body of seals is replaced by new hair. This period is called the molt season. The molt period lasts approximately 2 to 3 weeks.

The dolphin is 2.8 meters long and the Green anaconda is over 4 meters long.

Sanderia malayensis eat other jellyfish & small fish.

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.