narrow-headed vole
... that the slender head of the narrow-headed vole may have evolved to allow it to move more easily through crevices in frozen ground?
... that the slender head of the <b id="mwB0A"><a href="./Narrow-headed_vole" id="mwB0E" rel="mw:WikiLink" title="Narrow-headed vole">narrow-headed vole</a></b> may have evolved to allow it to move more easily through crevices in frozen ground?