...一九九零年代分别成长至1200只及3500只，但2008年时，印度野生动物研究所及国家老虎保育单位合作，运用相机陷阱（camera traps）进行调查，结果却完全不乐观，再度敲响警钟。
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At noon one day, as they were setting up camera traps, the team spotted their prize.
一天中午，当他们设置好相机陷阱后，就获得了这个发现。
They installed 420 camera traps in key protected areas, amassing some 52,000 photographs between 2008 and 2010.
他们在重点保护区内设置了420台触发式照相机，并在2008年到2010年收集了大约52,000张照片。
Zoo staff are currently raising funds to provide weather stations and camera traps to assist researchers in Madagascar to collect environmental data.
BBC: Linton Zoo celebrates rare white-collared lemur birth
The clouded leopard, the largest predator on Borneo, appears to live at very low densities within the reserve, as it has only rarely been photographed by the researchers or camera traps.
BBC: Earth News - Clouded leopard: First film of new Asia big cat species
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