Others react like a celebrity caught by paparazzi. In Africa and Asia, the cameras have to be housed in robust boxes to prevent them being used as footballs by elephants. Golden monkeys in China have been pictured coming down to the ground and urinating on the cameras.
Every ecologist has their favourite photo, of course. McShea's most treasured ones are of Takin, which are found in high alpine areas of China's panda reserves. (One is shown in the furthest picture to the left of the second row here.) "In the past, the only time I got to see them was when their butts were disappearing over the brow of a hill," he says. "Now I see them in a way that makes their personality come across. They are huge goats who look like the sort of creatures that only their mother could love."