The multicellular eukaryotic species known as animals, animals, fauna, wildlife, or animals comprise the biological kingdom Animalia.

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The multicellular eukaryotic species known as animals, animals, fauna, wildlife, or animals comprise the biological kingdom Animalia.  Animals, with very few exceptions, are able to move, reproduce sexually, eat organic materials, breathe oxygen, and evolve from a hollow ball of cells called a blastula during the embryonic stage of development.  A total of more than 7 million animal species are thought to exist, while more over 1.5 million living animal species—of which roughly 1 million are insects—have been described.

Wildlife traditionally refers to undomesticated animal species

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Wildlife traditionally refers to undomesticated animal species, but has come to include all organisms that grow or live wild in an area without being introduced by humans.[1] Wildlife can be found in all ecosystems. Deserts, forests, rainforests, plains, grasslands, and other areas, including the most developed urban areas, all have distinct forms of wildlife. While the term in popular culture usually refers to animals that are untouched by human factors, most scientists agree that much wildlife is affected by human