How brainless sea sponges use sunset as a cue to prepare for metamorphosis

A sea-sponge larva in the middle of metamorphosis. Océane Blard and Zac Pujic, CC BY Well before I start collecting coats, keys or shoes, my dog always knows when we’re about to leave. By picking up on subtle cues, he anticipates our next movements, reminding me he’s smarter than often shows. But anticipation isn’t always about the brains. Our new research reveals even an animal with no brain at all can anticipate what’s coming next. The metamorphosis of the sea sponge Sea sponges are one of…