Journal of Experimental Biology has highlighted a collaboration between MP2Lab and Universidad Nacional Autónoma de México on the light preferences of the sea slug Elysia crispata. In the section Inside JEB, Jarren Kay signs a piece entitled “Solar-powered sea slugs take cues from chloroplasts” explaining our paper “The photoacclimation state of stolen chloroplasts affects the light preferences in the photosynthetic sea slug Elysia crispata”. Our work shows that sea slugs avoided red light and preferred low over high light. More importantly, it demonstrates that when fed algae acclimated to high light, sea slugs increased their selection for high irradiances. This strongly supports our hypothesis that the acclimation state of the acquired chloroplasts affects animal behavior towards light. In the photo, a sea slug making the choice between low or high intensity light. Photo credits: Xochitl Vital.