Measuring up to 99-centimeters-long, and weighing up to 14 kilograms, Aplysia vaccaria, also known as the black sea hare or California black sea hare, is the world’s largest sea slug.

I knew slugs could get pretty large, but i never imagined one as big and heavy as a medium-sized dog. Then again, Aplysia vaccaria, is a very rare sight, even if you live near its very limited habitat – off the coast of California and in the Gulf of California – as it only ventures into shallow water to lay eggs. Like most other sea slugs, these giant mollusks are herbivores, with brown algae and kelp making up most of their diet. The color of the plants the slug east determines its own color, which is why it is black or dark brown, while other member of the Aplysia family are reddish or green.

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Slugs are not what you’d normally call “cute” creatures, but the Jorunna Parva species is an exception. These marine slugs bear a striking resemblance to small rabbits, which has recently earned them the nickname ‘sea bunnies’.

Jorunna parva slugs were discovered by Japanese malacologist Kikutaro Baba in 1938, but the rest of the world has only become aware of their irresistible cuteness last year, when footage from a Japanese diving school was released online. The clip, featuring parva off the coast of Japan, has gone viral on the internet and people all over the world are going ga-ga over the adorable underwater creatures.

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