The monkey tentatively grabbed the stinging nettle leaf while exploring. At first she appeared unsure about what to do with the leaf before she put it in her mouth. Seconds later her face grimaced in shock as the stinging nettle gave her a nasty nip before she spat it out in her hand and looked at it puzzlingly. She then decided to suck her thumb for comfort. Most animals don't generally react in the same way humans do to stinging nettles.