Although archerfish are called the "snipers of the animal world," divers probably don't have to worry about them. Archerfish hunt by firing precisely aimed streams of water at prey "as big as small lizards." What's truly amazing, though, is that archerfish are capable of adjusting how much water they use based on the size and strength of their targets. Using high-speed video, animal physiologist Stefan Schuster and his colleagues measured the speed of archerfish shots; using video that captures 5,000 frames per second -- more than 200 times faster than TV -- the researchers also measured the mass of each blast. Comparing the mass and speed at which the water-blasts were fired, Schuster and his colleagues discovered that archerfish fine-tune their attacks so their prey are hit with about ten times more force than the animals use to hold themselves upright.

Considering archerfish prefer tiny meals, there's little chance that one is going to stalk you and try to take you down. Nevertheless, getting a squirt on the rear as you're bending over to grab your fins could be a bit disconcerting, so be advised.