A common and widespread North American butterfly who’s caterpillars eat willows.  This butterfly is the famous mimic of the Monarch, (Danaus plexippus).  It used to be thought the Viceroy was a Batesian mimic, but now it’s been shown to have distasteful properties and would therefore be considered a Müllerian mimic.  It flies from spring to fall with 2 to 3 broods.