The smallest structure within an animal is a cell.
There are, in some cells, many smaller organelles and other structures.
insects are the smallest animals
The smallest acyclic ester is methyl formate, with the chemical structure CH3OCHO.
The smallest structure within an animal is a cell. There are, in some cells, many smaller organelles and other structures.
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Strictly speaking one celled animals such as amoeba are the smallest animals on Earth.
Single celled animals.
If by structure you mean organelles, then ribosomes.
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The smallest animals are insects, though collared pikas ( rabbit like animals), Tundra voles, and lemmings are smaller mammals.