Infrared Video Cameras for Wildlife

Hmmm.... very interesting. I have been pondering this since reading your post. How do you do the live streaming though? Would you need a wifi network or cell signal? By cable would be simple and cheap, laptop computer and video baby monitor.

Good point, P2P, that never occurred to me for some reason. Should be good for short distances.

Google "wifi trail cam" and click on "images".

Maybe a stupid idea, but how about just use a red filter on a spotlight and place it somewhere in the trees pointing down on the saltlick? They say many animals are oblivious to red light...

The trail cam I have - an LTL Acorn 5210MM - has the option to insert a simcard (obviously you would need cell signal) and transfer images to your email. I haven't tried this feature yet, and I doubt it would be the best solution. Though it could be interesting to place such cams at the trails that lead to the salt lick. Then at least you will be notified of what might be coming your way...
It has live view (a screen on the backside) in test-mode, however it adds some colored leds (red and blue) to test which motion sensor is active. I have no idea if this is normal in all trail cams, perhaps it is, I'm new to this.

After your request I did a short google search for a heat-sensing camera, it would be great for night walks/ drives. But when I read a review writing "a new affordable cam" and then saw the many-thousand dollar price I thought: Hmmm, maybe not...