Rangers look for an infrared camera deployed a month ago to capture traces of wildlife in Chengdu, Southwest China's Sichuan province, on February 7, 2015. They often retrieve the cameras every 40 or 60 days to collect the data and replace the battery and memory card. The cameras are often placed at some secluded areas out of the way of people in order to capture the traces of animals because animals are easily frightened by people. [Photo/VCG]