The orca is said to be the fastest of all cetaceans at 55 km/h.

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.

Common bottlenose dolphin and Pacific white-sided dolphin are mammals, alligator snapping turtle are reptiles, and Sand tiger shark are fish.

We measure through the anus because it allows us to measure a certain temperature.

Penguins do not have teeth in their mouths. They have small soft spines on their upper and lower jaws to keep their prey from escaping.