Which animal has the longest gestation period for a marsupial?

The marsupial with the longest gestation period is the Tasmanian devil, which can have a gestation period of up to 3 weeks. This is relatively short compared to placental mammals, which can have gestation periods of several months.

During the gestation period, the Tasmanian devil's embryos develop within a structure called the yolk sac placenta, which provides the developing embryos with nutrients and oxygen. After the gestation period, the Tasmanian devil gives birth to a litter of joeys, which continue to develop outside the womb in the mother's pouch.

While the Tasmanian devil has the longest gestation period of any marsupial, it is worth noting that gestation periods can vary widely between different marsupial species, ranging from just a few days to several weeks.