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Well, when you say "animal" that's a very broad term. In Binomial Nomenclature, Animalia refers to bugs (or arthropods if you want to be scientific), birds, fish, mammals, etc. Because of this, there are many animals that are smaller than your thumbnail. Therefor, there are many species which are smaller than your fingernail, including many bugs, plankton, etc.

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13y ago

What else can I help you with?