process in which the concentration of a substance increases as it passes up the food chain.
measure of the amount of a substance or grouping in a specific place.
(dichloro-diphenyl-trichloroethane) toxic chemical used as an insecticide but illegal for most uses in the U.S. since 1972.
group of organisms linked in order of the food they eat, from producers to consumers, and from prey, predators, scavengers, and decomposers.
danger or risk.
protected area built by birds to hatch their eggs and raise their young.
natural or manufactured substance used to kill organisms that threaten agriculture or are undesirable. Pesticides can be fungicides (which kill harmful fungi), insecticides (which kill harmful insects), herbicides (which kill harmful plants), or rodenticides (which kill harmful rodents.)
animal that hunts other animals for food.
organism that eats plants or other autotrophs.
bird of prey, or carnivorous bird.
organism that eats meat.
carnivore that mostly eats other carnivores.