Don't wear cologne in the rainforest.

Here's a hint: Don't wear cologne in the rainforest.

Researchers at the Bronx Zoo compared dozens of scents and discovered that jaguars are attracted to the cologne Calvin Klein Obsession for Men.

This fact is now used by researchers in the field, as they can use the cologne to attract jaguars and other wild cats to camera traps and better monitor wild populations. They not only get images of the cats in these traps, but the cologne is particularly good at causing a "cheek rubbing" behavior which leaves behind hairs that can be used in DNA analysis.

So- visiting the jungle? You can leave the Calvin Klein cologne at home.