 They also quickly learn to invite preferentially those individual eels that collaborate most often.Similarly, zebra lionfish that detect the presence of small prey fishes flare up their fins as an invitation to other zebra lionfish, or even to another species of lionfish ("Pterois antennata"), to join them in better cornering the prey and taking turns at striking the prey so that every individual hunter ends up with similar capture rates.Mosquitofish ("Gambusia holbrooki") can distinguish between doors marked with either two or three geometric symbols, only one of which allows the fish to rejoin its shoalmates.