Researchers observed the common cuttlefish (Sepia officinalis) routinely wave its arms in four flashy gestures. Cuttlefish wave their expressive arms in four distinctive dancelike signals—potentially ...

Researchers presented the cuttlefish with two options: a case with some shrimp or a case with more shrimp. Each case contained between one and five shrimp, and the cuttlefish always picked the case ...