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This is called the gestation period in mammals, and pregnancy in humans.
Elephants,mammals
Butterflys do not "get pregnant".
They are insects.
Mammals get pregnant.
They give birth via pregnancy.
Platypuses do not have pregnancy. Although they are mammals, they are monotremes, which is the small group of mammals which lay eggs.
Platypuses lay between one and three eggs at a time, once a year.