The browntail moth is an invasive species of both forest and human health concern. Browntail moth (BTM) populations in Maine have been steadily decreasing over the past couple of years, but higher populations of browntail moth have been found in portions of Androscoggin, Cumberland, Hancock, and Oxford Counties this year. The microscopic hairs found on browntail moth caterpillars, shed skins, and cocoons can cause skin reactions and breathing problems. Providers should be aware of the risk of browntail moth hairs. Browntail moth caterpillars are hairy, dark brown caterpillars with two red-orange dots on the back. Older caterpillars have two broken white stripes running from head to tail.