The Red Sea roving coralgrouper (Plectropomus pessuliferus marisburi), which can use "sign language" to hunt. Two types of fish have been shown to use gestures, or sign language, to help one another ...

Two types of fish have been shown to use gestures, or sign language, to help one another hunt. This is the first time these types of gestures have been found to occur in animals other than primates ...