On 22 May 2013 the WWF released dozens of photographs and video footage of endangered species captured by camera traps in the mountainous giant panda reserves in China, marking this year’s International Day for Biological Diversity. With the footage, taken since 2011, WWF conservation officers have gained a better understanding of the identification of animal traces and areas of their activities, the study of the impact of human activities on the species and management of nature reserves, according to Jiang.