Answer:

platypi

AnswerCrossword Clue
PLATYPISwimmers with beaverlike tails
PLATYPISwimmers with flat feet
PLATYPIEgg layers
PLATYPIToothless mammals
PLATYPIVenomous mammals
PLATYPIDuckbills.
PLATYPIDuck-billed swimmers
PLATYPIEgg-laying mammals