In reply to NathanP:
I have a Bushnell one which works ok. I agree with comments on keeping the lens clean, avoiding direct light and rain.
I find the video mode works better than the still mode at night as the shutter speed is too low for stills so everything is blurred.
Also I don't run the camera at full resolution because it's interpolated and finer than the native resolution of the sensor therefore is a waste of time.
Our camera catches birds, foxes, badgers digging up the lawn and cats crapping in the freshly dug holes.
The camera is only supposed to be used with alkaline or lithium batteries as the low voltage threshold declares that NiMH batteries are flat at the outset which is irritating.