Sponges are popular food source for nudibranchs. The slugs incorporate the color from what they eat to their tissue color as camouflage. This beautiful pair have found a toxic finger-sponge (Negombata magnifica) to feed on. They won't be harmed, and instead use the chemicals to reduce the chance of being eaten.

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Pyjama Nudibranch

In addition to having the ability to regenerate limbs, most sea stars are able to eat outside of their bodies by moving its stomach inside the prey to ingest it.