So far we have the High Tech Hunting Pack, which give some cool night vision stuff, and led blinking arrows, a bow sight, and some bows too. But also, it would be really cool to have thermal scopes and binoculars.
This could include a thermal scope, thermal binoculars, and maybe a bow sight. (not sure if that is real)
To make it a bit realistic, you could show more heat towards the heart area, because logically it would be the warmest from constantly beating. And you could also take an extra step and make any cold blooded animals slightly less bright.
(Scope concept, and yes I know im bad at editing)