You’ve just encountered Doto greenamyeri, and it’s a real weirdo. Nicknamed the donut sea slug for obvious reasons, this nautical nudibranch recently starred in Bryan Blauvelt’s Underwater ...

reveals that this small sea slug is both remarkably heat-tolerant and genetically diverse across its wide range—key traits that make it an ideal partner for climate-resilient coastal restoration.

This method of protection can keep almost all predators at bay - but not the kaleidoscopically colourful sea slug. Nudibranchs, commonly known as sea slugs, are a group of shell-less marine molluscs.