Predation provides energy to prolong the life and promote the reproduction of the organism that does the killing, the predator, to the detriment of the organism being consumed, the prey.

"With this data, we can now map them out across the country to provide the first abundance map of our country's most important predator ... include Austin Green, Science Research Initiative ...

Science 185, 1058-1060 (1974). Grabowski, J. H. Habitat complexity disrupts predator-prey interactions but not the trophic cascade on oyster reefs. Ecology 85, 995-1004 (2004). Gruner, D.