Endangered species by fatima zohra mohamed moubchir https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s About animals in danger of extintion en-us 2017-04-12 22:10:39 UTC 2026-02-02 18:54:28 UTC hello@padlet.com fatimazohramohamedmoubchir https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166176969 https://www.youtube.com/watch?v=0Nw3TTvQGrA]]> 2017-04-12 22:36:09 UTC https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166176969 fatimazohramohamedmoubchir https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166177119 2017-04-12 22:39:18 UTC https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166177119 fatimazohramohamedmoubchir https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166177148 2017-04-12 22:39:52 UTC https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166177148 fatimazohramohamedmoubchir https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166177166 2017-04-12 22:40:09 UTC https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166177166 Introductionendangered species, any plant or animal species whose ability to survive and reproduce has been jeopardized by human activities. In 1999 the U.S. government, in accordance with the U.S. Endangered Species Act (1973), classified 935 native species as endangered or threatened, including animals such as the Florida panther, the Key deer, the San Joaquin kit fox, the northern spotted owl, the chinook salmon, the Karner blue butterfly, the snail darter, and the cave crayfish and plants such as the Hawaiian nehe and the clover lupine. Over 500 more species were so classified worldwide. The official list of endangered wildlife and plants in the United States is kept by the Fish and Wildlife Service; the National Marine Fisheries Service oversees marine species. In addition, many states keep their own lists. The International Union for the Conservation of Nature and Natural Resources maintains an international list, published as the Red Data Book. fatimazohramohamedmoubchir https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166867259 2017-04-18 19:27:00 UTC https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166867259 endangered species: Causes of EndangermentHunting, trapping , and poisoning to protect livestock have taken a great toll among predatory mammals and birds. Overharvesting is currently threatening species worldwide, especially food fish species such as the cod . A large number of species are threatened by introduced species, or exotics, plants or animals that are introduced into a habitat and bring with them diseases or the ability to compete more effectively than native species. The now ubiquitous European starling, for example, purposely introduced into the United States in the 1890s, is displacing the native American bluebird and other species, and the brown tree snake, native to Australia and introduced to Guam during World War II, has preyed on native species of that island to the extent that nine bird species are now extinct. Another danger is hybridization with other species and subspecies.Another important threat is destruction of habitat by chemical pollutants. For example, bird populations have suffered great losses because of insecticides . The chemicals they contain, such as DDT , accumulate in birds' bodies and interfere with calcium metabolism. As a result, the females lay eggs with extremely thin shells or no shells at all, so the embryos do not survive to hatching. Acid rain has destroyed the habitats of many North American fish and amphibians by lowering the p H of surface waters. It is also changing the soil chemistry and harming many tree species.Most serious of all, the destruction of physical habitat—by the drainage and filling of swamps and marshes, by the damming of rivers, by the leveling of forests for residential and industrial development, by strip mining, and by oil spills and water pollution—has left many creatures with literally no room in which to live and breed. For example, only 5% of the original forests in the 48 coterminous states, i.e., those forests that were present at the time of the first European settlement, are still standing. fatimazohramohamedmoubchir https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166867508 2017-04-18 19:28:13 UTC https://padlet.com/fatimazohramohamedmoubchir/flwvel6qcw3s/wish/166867508