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Many freshwater fishes are also popular as food.
There are some species in the animal kingdom that do just fine with a single meal a month or...
This lesson presents which animals developed feathers during the course of evolution.
A transitional form between fish and tetrapods, or four-limbed vertebrates.
Quetzalcoatlus was one of the largest known flying animals of all time.
Chameleons are reptiles with an ability to change their colours.
During the evolution of vertebrates the relative development of brain areas has changed.
A gull species typically found on European beaches; it is easily recognisable by the distinctive...