✔ 最佳答案
1. The primary threat to Nile crocodiles, in turn, are humans. They are threatened by pollution, hunting, and accidental entanglement in fishing nets. The Nile crocodile was hunted, primarily for high-quality leather, though also for meat and purported curative properties. Therefore, the population size of Nile Crocodile is getting small.
2. We need to protect them as they have high conservation status. The Conservation Status of the Nile crocodile under the 1996 World Conservation Union (IUCN) Red List is "Lower Risk" (Lrlc). The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) lists the Nile crocodile under Appendix I (threatened with extinction) in most of its range; and under Appendix II (not threatened, but trade must be controlled) in the remainder, which either allows ranching or sets an annual quota of skins taken from the wild.
3. The preferred habitat of Nile crocodiles is along rivers, in freshwater marshes, or along lakes; in some cases they thrive in more brackish water, along estuaries or in mangrove swamps. They are found in most of Africa south of the Sahara Desert, extending as far south as Kruger National Park and the Waterberg Massif in South Africa; they also occur in northern Madagascar, and along the Nile River basin.
Pictures of Nile Crocodile:
http://www.reisbegeleider.com/cpg145/thumbnails.php?album=246
Map showing distribution of Nile Crocodile:
http://en.wikipedia.org/wiki/Image:Crocodylus_niloticus_Distribution.png