Also known as the Pale Tussock, the Dasychira Pudibunda is a moth native to Denmark. Its bright yellow caterpillars are covered in patches of spiky hair that resemble porcupine quills, and along the center of their back is another row of hair tufts, one on each segment of its body, culminating in a large black or brown spine at the rear end.From a distance the caterpillar resembles a sponge, but up close, where you can actually see the double row of mandibles, it’s not quite so cuddly. Every now and then, Pale Tussock populations will explode, resulting in a carpet of these caterpillars covering the trees. In 1988, a wave of Pale Tussocks demolished 20 hectares of beech forest in Denmark.