The giant otter swims at high speed by waving its tail and body up and down, using its webbed feet to steer. On land it is far less agile, and is often seen sitting grooming itself. Giant otters are diurnal - only active during the day. The catch prey in their mouths and hold it in their forepaws to eat it on the shore. During the dry season, the otter groups are restricted to small areas of water, but when the rains come to flood the forest, the otters can roam over larger areas. Little is known about the mating habits of giant otters, other than that the young stay with their parents for a few years before reaching adulthood.