How can some animal smell something so farrr away like a few kilometers away?

Question

I just never understand how it works

In: Biology

Answer 1

You may be familiar with the concepts of “downwind” and “upwind”. Scent mostly comes from the millions of skin cells your body is shedding constantly (along with chemicals like pheromones), which get carried along the wind. If the animal in question isn’t downwind from you they’re not as likely to pick up your scent