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What group of mammals has the most members?

Answer:
There are three main infraclass taxa into which the mammals are divided. These divisions are based on how the young are born. Of the monotremes, the marsupials and the placentals, the placental mammals far outnumber the others.

If you meant orders, then Rodentia is the largest, followed by Chiroptera (bats).
First answer by Quirkyquantummechanic. Last edit by Ptorquemada. Contributor trust: 554 [recommend contributor recommended]. Question popularity: 2 [recommend question].

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