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The most ancient group of animals, they live underwater, lack real tissues and body symmetry.
The largest species of lizard that lives in isolation. Even a single bite of it can be fatal.
The animation demonstrates the most important types of feathers and their fine structure.
A gull species typically found on European beaches; it is easily recognisable by the distinctive...
Several analogous types of eyes have developed independently through convergent evolution.
The dromedary is an indispensable animal for inhabitants of the deserts.
The American bison is the largest land animal in North America.
A transitional form between fish and tetrapods, or four-limbed vertebrates.