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Endangered Species

Discover the causes of species extinction and the efforts made to protect endangered animals. Learn about habitat alteration, commercial hunting, and other threats. Explore the steps in classifying risk and the significance of the Endangered Species Act. Find out how various species, like the Bald Eagle and the California Condor, have been brought back from the brink.

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Endangered Species

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  1. Endangered Species What’s Happening?

  2. Causes of Extinction • Habitat alteration 40% • Commercial hunting 23% • Competition with introduced species 16% • Pest Control 7% • Subsistence food hunting 6% • Captured to serve as pets 5% • Superstitious beliefs 2% • Pollution 1%

  3. Definitions • Habitat alteration: changes in an organism’s habitat such as logging, landfill, dredging, clearing for development, flooding. • Commercial hunting: hunting of animals for financial gain • Introduced species: organisms that do not naturally live in the area • Subsistence food hunting: hunting of animals for food • Superstitious beliefs: killing of organisms to use in religious ceremonies or for scientifically unsupported superstitions (ex: killing a bear for its spleen or a rhino for its horn).

  4. Steps in classifying risk • Step 1: Species of “special concern” • Step 2: Rare • Step 3: Threatened • Step 4: Endangered

  5. Endangered Species Act • Started in 1973 • Federal program • Encourages the establishment of state programs • Provides for the conservation of ecosystems upon which threatened and endangered species of fish, wildlife, and plants depend.

  6. Some species brought back • Bald Eagle California Condor • Red Wolf • Whooping Crane American alligator

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