How can snakes smell fear?

Answer 1

Snakes fear their predators, which include larger animals and birds. Snakes will become agitated when a shadow passes over them, a large animal approaches or downward pressure is applied to their bodies. - Animal control personnel tasked with relocating snakes are aware of these behaviours and use them to their own advantage. Snakes have little objection to being lifted from underneath with a handling hook and will readily go to hide in a black bag.

Answer 2

Wha...? Why would anything be able to smell something you think?

Answer 3

Bears and others too