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Subject: 
Environmental Science
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Tags: 
Environment
Biology
Conservation
Ecology
International Union for Conservation of Nature
Millennium Development Goals
Philosophy of biology
Endangered species
Extinction
biodiversity
Endangered Species Act
Conservation biology
APES

Chapter 12 Sustaining Biodiversity: The Species Approach Core Case Study: The Passenger Pigeon - Gone Forever Once the most numerous bird on earth. In 1858, Passenger Pigeon hunting became a big business. By 1900 they became extinct from over-harvest and habitat loss. Figure 11-1 SPECIES EXTINCTION Species can become extinct: Locally: A species is no longer found in an area it once inhabited but is still found elsewhere in the world. Ecologically: Occurs when so few members of a species are left they no longer play its ecological role. Globally (biologically): Species is no longer found on the earth. Global Extinction Some animals have become prematurely extinct because of human activities. Figure 11-2 Endangered and Threatened Species: Ecological Smoke Alarms

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