Bigfoot FLIR 30 Minutes After Dark

I was coming back from a swamp area where I had been all day. I had heard activity all day but did not see anything. After the sunset I used this camera to scan the tree line because I thought something was dogging me behind the trees. The FLIR says no. Heat can be seen from the sky and the surface of grass and trees but nothing in the tree line. I really need to get my own FLIR. I don't have the 40 grand that you would need to get the model they use on Finding Bigfoot. There are less expensive models but you get what you pay for. I still think there is something there.