Interesting. This opens up a whole new realm of nature documentary film-making based around unobtrusive cameras. I don't see animal behavior differing very much, but a human presence certainly is not something the animals can ignore.<p>That said, some of the animals in the pictures saw the camera -- not exactly discreet.
My friends have used game cameras for a number of years now. They give video to the game wardens to document the number of wild hogs and their travel patterns on their property in the river bottom. The number of hogs around here is mind boggling, they are encroaching farther and farther into large cities.
They work equally well for observing higher primates. :D<p>We, (local crime watch), use the same types of cameras to keep an eye on vacant houses in the neighborhood. So far we've assisted the police in tracking vandals and drug dealers. (Not to mention countless non-criminal animals...)