South Andean Deer
...that males of the endangered South Andean Deer have a distinctive black "face mask" that forms an elongated heart-shape?
...that males of the <a href="./Endangered_species" id="mwC9k" rel="mw:WikiLink" title="Endangered species">endangered</a> <b id="mwC9o"><a class="mw-redirect" href="./South_Andean_Deer" id="mwC9s" rel="mw:WikiLink" title="South Andean Deer">South Andean Deer</a></b> have a distinctive black "face mask" that forms an elongated heart-shape?