ANIMALS (Animalia) - organisms that form part of the organic world. Animals are heterotrophs because they do not have the ability to synthesize nutrients from inorganic compounds, and foods are organic compounds. Also among the distinguishing features of the animals is the ability to actively move.

Animals are represented by two main types of organisms - unicellular and multicellular. Today, there are about 1.5 to 2 million different species of animals, large and small, living in the water, on land, in the air. Among this diversity of species of greatest diversity of fauna is represented by insects.

Classification of animals, until recently, has not found a clear structure. For example, the simplest of late is not considered a type, as referred to subkingdom animal kingdom. The animal world can be divided into cold-blooded (fish, amphibians, reptiles) and warm (mammals, birds). Under the influence of anthropogenic factor numbers of many species of animals inevitably reduced, and some species have disappeared altogether.

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