How long is the gestation period of a nine-banded armadillo?

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Nine-banded armadillo (Dasypus novemcinctus). — armadillo Nine-banded armadillo (*Dasypus novemcinctus*).

The gestation period of the nine-banded armadillo is four months. However, this duration does not include a variable delay period of up to several months that can occur between the fertilization of the egg and its implantation in the wall of the uterus.1