The oak processionary moth, found mostly in trees in west London, is covered in sharp hairs containing toxins during its caterpillar stage.
These can be blown into contact with people, causing skin rashes, itchy eyes and triggering asthma attacks.
You nasty little bugger!
As a caterpillar, each oak processionary moth has around 62,000 hairs, which they can eject at will.
Hairs that fall to the ground can be active for up to five years.
You nasty nasty little bugger!