Blue-gray Taildropper

Prophysaon coeruleum, (the blue-grey taildropper), is a small species of slug belonging to the genus Prophysaon, a genus known for autotomy. It is native to western North America, from southwestern British Columbia to northwestern California, with a more isolated population in Idaho. There are conservation efforts in place to protect this species, and they are on multiple lists of species at risk.