‘Solar-powered’ sea slugs have specialized depots in their cells that store photosynthetic equipment looted from algae, a study reports. These depots provide just the right chemical environment to keep the stolen apparatus, called chloroplasts, alive and working to turn sunlight into nutrients.

“It was the wildest thing that we had seen,” says study co-author Nicholas Bellono, a biologist at Harvard University in Cambridge, Massachusetts. The authors also found that, in lean times, the slugs can raid these compartments to consume chloroplasts.

The compartment “is basically like a moving refrigerator of chloroplasts where, after a period of starvation, the slugs can switch from storage to consumption to survive”, Bellono says.

The findings were published in Cell.