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Many freshwater fishes are also popular as food.
Otters are semi-aquatic predatory mammals.
The axolotl, also known as Mexican salamander, is an amphibian species that keeps its...
A type of large freshwater crayfish widespread in Europe.
Extinct proboscidea closely related to today's elephants, often hunted by prehistoric man.
The tiny predator of the oceans. Interestingly, the male seahorse carries the fertilized eggs in...
The animation demonstrates the most important types of feathers and their fine structure.
Living fossil, important stage in the evolution of tetrapods.