While the earliest proboscideans lived in or near water, their evolved descendants specialized in living on firm ground - while so, they retained an everlasting liking towards water. Continuing with Deinotherium, the proboscideans more and more became what we today know als elephants. The second branch, parting from the aforementioned, returned to a water-based lifestyle.
While standing, the Brushtail's trunk does not reach the ground. Feeding on dry land would pose quite an exercise for the animal, but while diving, the trunk makes an excellent plant-grasping device. To further push its swimming abilities, its toes are slightly webbed. The vertically pronounced tail serves as a rudder. At first glance, its hairy tip gives the impression of incomplete shaving, but in fact it is used to determine water flow and speed. As with various water-dwelling mammals, the Brushtail can fold its ears to prevent water from entering.