When do mountain pygmy possums hibernate?

Mountain pygmy possums hibernate during Australia's winter. Females typically enter hibernation prior to winter, between February and April (depending on the climate experienced by the population), while males and juveniles remain active a little longer, entering hibernation as late as May or June. Bouts of hibernation last up to 3 weeks for the mountain pygmy possum, and are interspersed with short periods (around a day in length) of normothermia.

The hibernation period can last for up to seven months in adults and five to six months in juveniles.