Animals

The territory of the marten can cover up to 20 km² (12,5 sq mi) for males (although it is usually four times smaller). Females require a smaller territory, from 1.5 to 6.5 km² (0,9 to 4,3 sq mi).

The Amazon river dolphin acquires its pink hue with age.

Each leg ends in a pair of claws and pulvilli.

However, there are snails that do not have radula.

They lay one to three eggs in single clutch.

Female red pandas are fertile for two days each year.

They produce one brood a year, the female lays 8 to 13 eggs.

The axolotl is native to Lake Xochimilco and Lake Chalco in the Valle de México, Mexico City.

Tadpoles and eggs are also venomous.

The circulatory system of snails is open. This means that hemolymph (equivalent to blood) is pumped into the body cavities surrounding the internal organs.