科学美国人60秒 SSS 2014-09-16（在线收听）

 The business world is sometimes described figuratively as doggy dog. In the state of Maharastra, in western India, the situation is literally cat eat dog. Where the cats are leopards and dogs are, well, dogs. That's the findings of a  wildlife conservation society study published in the journal <Oryx>. The paper points out that big cat ecology and predator-prey interactions in tropical regions are typically studied in natural systems. The majority of the prey in those cases are angulates, zinc, zebras or deer. But in human dominated areas, especially agricultural ones, you can have large populations of domesticated animals of big attraction from any hungry wildlife. Researchers examined 85 leopards' scads, because that's how you do this kind of research, and 87 percent of the prey biomass they were covered was from domestic animals, with nearly half of that coming from dogs, many of them presumably feral. livestock makes up only a small part of the leopard diet. For example, goats outnumber dogs 701 but are just 11 percent of meals for the cats. Probably because of their pendin at night. Those numbers are good news because they may calm farmer's fears about heavy losses of  agriculturally valuable species. Of course, it's not good news for the dogs.