These little sea creatures, affectionately dubbed “sea bunnies” have recently become social media celebrities. They’re actually sea slugs, and belong to the wild group of mollusks called nudibranchs. The bunny slug species is Jorunna parva, and was first described by the renowned Japanese marine biologist Kikutaro Baba. The fluffy white sea bunnies are primarily found off the coast of Japan. Jorunna parva have also been found in the Indian Ocean and off the coasts of the the Philippines.
Source:https://www.treehugger.com/natural-sciences/adorable-science-behind-sea-bunny.html