It's what an archerfish shoots to bring down insects
The archerfish successfully shoots down the resting insect by spitting 
water... [DOC] [TLE] The fish that SPITS to kill: Archerfish uses complex physics to ... [PAR] Dec 2, 2013 ... A species of fish that has a killer aim uses physics to hunt for its prey, ... insects 
and small animals by shooting them down with jets of water.