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Keystone species of organisms define biological communities. Meet the American alligator as an example. Emerging ecologists also learn what happens is a keystone species is removed from an ecosystem: ecological release. Examples of this process include the sea urchin explosion that occurred when sea otter populations declined and a jack rabbit bombardment when ranchers killed off too many coyotes. Conclude the presentation with a discussion: Are we, as humans, undergoing an ecological release?