A photo of one such creature was captured by ... Due to these ringlets, the creature has been nicknamed the donut sea slug.

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.

Scientists have discovered the ultimate case of regeneration: Some decapitated sea slugs can regrow hearts and whole new bodies. This “wonder of nature,” reported in a biology journal on ...