Meet the Brown-tail Moth (Euproctis chrysorrhoea)

The upper surface of the wings of this species is pure white. Males may have some brown color on the underside of the forewing. Wingspan is 36–42 millimetres (1.4–1.7 in). The body is very hairy and white except for the tail which is covered in reddish-brown hairs, much more prominent in the females.[8] Males have larger antennae, used to detect pheromones released by unmated females. Females have a larger body.[8] As winged adults, this species is superficially similar in appearance to Euproctis similis (native to Europe) and Hyphantria cunea (native to North America), but female E. similis have a yellow tail tuft and H. cunea lacks tail tuft coloration.