Burmese Pythons are mainly nocturnal rainforest dwellers.[23] When younger they are equally at home on the ground and in trees, but as they gain girth they tend to restrict most of their movements to the ground. They are also excellent swimmers, being able to stay submerged for up to half an hour. Burmese Pythons spend the majority of their time hidden in the underbrush. In the northern parts of its range, the Indian python may brumate for some months during the cold season in a hollow tree, a hole in the riverbank or under rocks. Brumation[24] is biologically distinct from hibernation. While the behaviour has similar benefits, specifically to endure the winter without moving, it also involves preparation of both male and female reproductive organs for the upcoming breeding season. There is controversy over whether the Burmese species is able to brumate.