system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why cats hang open their mouths a bit when they smell something odd

edit: thank you for the answers!
gpt
Not an expert, but cats have something called a jacobsons organ or vomeronasal organ located on the roof of their mouth. It is particularly good at detecting pheromones. Breathing through the open mouth would expose the organs to more of the the chemical in the air. The flehmen response is the funny face they make to direct more of the chemicals to the organ.