A beautiful nudibranch (Hypselodoris bullockii) crawls slowly across a reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

animal animal themes animals in the wild aquatic biodiversity bullock's hypselodoris cerata chromodorididae close up color image coral triangle crawling dorid nudibranch gastropod habitat horizontal hypselodoris bullockii indonesia invertebrate living organism macro marine biology mollusk nature no people nudibranch ocean opisthobranch outdoors pacific ocean photography purple rhinophore science sea sea life sea slugs southeast asia tropical climate undersea underwater vibrant wilderness wildlife zoology