The dolphin has a smooth eggplant-like skin to reduce water resistance so that it can swim faster. Incidentally, dolphins renew their skin every two hours.

The green anaconda lives in the Amazon River in South America. It is a huge snake that can grow up to 9 meters. Females are larger.

Gentoo penguins are the fastest swimmers among penguins. The average speed of king penguins is about 8 km/h.

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.

About 95-97% of their body is made up of water.