Hefneri is the most recently recognized subspecies of the marsh rabbit. It's small with short, dark brown fur and a grayish-white belly. Discovered in 1984, the subspecies was named in honor of Hefner after his organization donated money to support fieldwork on the rabbits. Good for Hef!
His namesake bunnies live in an island environment and are dependent on specific grasses and plants for feeding, nesting and shelter. Population growth and development in their area has led to the death of the bunnies at the hands of vehicles or domestic animals. Their natural habitat also is being destroyed.
http://blogs.discovery.com/news_animal/2009/06/playboy-bunnies-close-to-extinction.html -via Digg
(image credit: Rosanna Tursi)