And little they are, growing to a maximum length of seven or eight millimetres upon adulthood and living between six months and a year. According to Gosliner, leaf sheep are hermaphrodites (having both male and female reproductive organs) and must mate with another individual to produce an egg mass. "The eggs hatch into shelled larvae that spend a week or two in the plankton. Then, they discard their shells and begin their life as a small slug," he said.
