Cougars are threatened by habitat loss and by direct persecution by humans. The latter is primarily caused by the perceived threat of cougars on livestock, although the risk of attacks on humans is sometimes used to justify the killing of a cougar near urban areas. In reality, cougars have a minuscule effect on livestock numbers. In Texas in 1990, for example, cougar kills amounted to 445 sheep (0.02 percent of a total of the state's total of 2.0 million sheep and lambs) and 86 calves (0.0006 percent of the state's total of 13.4 million cattle and calves).
Attacks on people are incredibly rare, but are increasing due to expansion of human populations into cougar habitat. In the hundred years spanning 1890 to 1990, there were only 53 confirmed attacks by cougars on humans, resulting in ten deaths. From 1990 to 2004, the number of attacks had climbed to 88 with a total of 20 deaths. Even though the frequency of attacks on humans is relatively small, those which do happen are heavily covered by the media, effectively maligning cougars in the public eye and drawing attention away from the critical roles they play in many ecosystems.
However, the main reason behind cougar decline in the U.S. is habitat loss through degradation and fragmentation. Research shows that cougars need at least 850 square miles of uninterrupted habitat in order to persist with only a low risk of extinction. With urban areas becoming more numerous, many scientists are calling for the expansion of protected habitat corridors so that cougar populations could exist and move without needing to traverse through civilization.
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