Tag Archives: Milbert’s tortoiseshell

Milbert’s tortoiseshell (Aglais milberti)

Milbert's tortoiseshell

Photo by Bill Reynolds

Milbert’s tortoiseshell (Aglais milberti) is a fairly common, medium-sized, brushfooted butterfly. It is found in woodland openings, open areas near woodlands streamsides, trails, and roadside ditches. In Minnesota, stinging nettle is the only host plant for the caterpillars. There are two broods each year. Adults of the second brood hibernate, sometimes in groups, in bark crevices or on human structures. When they emerge from hibernation in the spring they are pale and appear tattered.