rare skipper
... that the butterfly rare skipper was only known from five rivers in the United States until sometime in the 1980s?
... that the butterfly <b id="mwAsA"><a href="./Problema_bulenta" id="mwAsE" rel="mw:WikiLink" title="Problema bulenta">rare skipper</a></b> was only known from five rivers in the United States until sometime in the 1980s?