Domestic dog

Dogs are the domesticated subspecies of gray wolves.

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The mallard

One of the most common types of Anatidae, the ancestor of the domestic duck.

Dentition of mammals

The dentition of different species of mammals reflect their feeding habits.

Vertebrate brain evolution

During the evolution of vertebrates the relative development of brain areas has changed.

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A film about the green iguana, the popular inhabitant of exotic terrariums.

How do fish breathe?

Blood vessels in fishes' gills absorb oxygen and release carbon dioxide.

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