What exactly is a trail camera? How does it differ in the ability to photograph animals than any other camera I may already have? Does it have to do with size or shape, lens size or type, or other features that are unique?
Trail cameras are motion sensitive cameras that are secured to trees or other objects to capture animals or people passing by on a trail.
They look like this,
They have attachments for the straps and lights for a flash after dark, some will infrared pictures as well and video and they are set up to trigger the pictures by motion, usually animals moving by although you have to be careful as branches moving in the wind can do it as well.
You end up with pictures like this,