Trail Cameras are used by explorers, hunters, gardeners and scientists to take pictures of wildlife without a human having to be present. A trail camera takes photos by itself, being triggered when an animal crosses an infrared beam. They are a great way to scout big bucks, or to finally catch the varmint who is raiding your garden. Scientists use trail cameras to take pictures of rare species deep in the rainforest, or to prove that grizzlies really do exist in the Bitterroot valley.
There are both digital trail cameras and regular old film trail cameras.