Island Marble butterfly Feds Seeking Endangered Species Protection For Rare Island Marble Butterfly By Bellamy Pailthorp • Apr 11, 2018 Karen Reagan / US Fish and Wlidlife Service Listen Listening... / 1:28 Federal wildlife officials want to protect a rare green-and-white butterfly that is only found on San Juan Island by listing it as an endangered species. The tiny creature has been declining since it was rediscovered twenty years ago. Its population is now estimated at fewer than 200 in the wild. The Island Marble Butterfly: A Rare Little Beauty Fighting for Survival On San Juan Island By Jennifer Wing • Jun 17, 2016 Scott McCarthy, U.S. Fish and Wildlife Listen Listening... / 1:43 An incredibly rare Northwest butterfly has been listed as a species that qualifies it for federal protection. It’s small, and at first glance, it's mostly white. It’s called the Island Marble butterfly.