A green sea slug appears to be part animal, part plant. It's the first critter discovered to produce the plant pigment chlorophyll.How thuggish of the slug to steal plant genes
The sneaky slugs seem to have stolen the genes that enable this skill from algae that they've eaten. With their contraband genes, the slugs can carry out photosynthesis — the process plants use to convert sunlight into energy.
and plug them into its cells to make itself green!
Granted, it's also one of the neatest genetic tricks that's ever been seen.