DO some snakes have heat vison?

No, only pit vipers, pythons and boas that live in trees have heat seeking capabilities. These animals have special pits around the top of their mouths that sense warmblooded prey. It works a little like infrared technology.

Some of these animals can even catch birds in flight. It is amazing.

Note that not all pythons and boas have pits. Boa constrictors, for example, don't have pits.

Most common snakes you'd find living in the wild in the US do not have pits. Only rattlesnakes and copperheads would have pits.