The gestation period for kangaroos varies depending on the species, but it generally lasts between 29 and 40 days. However, for the larger kangaroo species such as the red kangaroo, the gestation period can be as long as 36 to 40 days. After giving birth, the female kangaroo usually carries her young, called a joey, in her pouch for several months until it is developed enough to survive outside. The joey may continue to nurse from the mother for up to a year.