THEY CAN MAKE MAPS

Along the shores of the Gulf of Mexico live small fish called frillfin gobies. Swimming around at high tide they memorise features of the seabed and figure out where rockpools will form when the water recedes. At low tide, if a goby gets stuck with a predator in a pool, it knows which emergency escape route to take. It leaps in precisely the right direction to land in a neighbouring pool. When scientists remove these fish and then return them to their territories weeks later, the gobies still remember their mental maps and jump to safety.