a species of sea slug that looks as though it were dropped into the ocean from outer space. Improbably, the work would prove foundational to our understanding of how humans learn about the world ...

They’re sea slugs, part of the Dotidae family. And while they’re small — measuring less than a quarter of an inch — they can have an outsize impact, according to a researcher who studies them.

Canva This deep sea slug amounting to the size of only 1cm is one of the rarest herbivores in the aquatic kingdom. Also called 'leaf sheep' and 'Shaun-the-sheep' it feeds on marine algae.