Littledale's whistling rat
... that Littledale's whistling rat can be distinguished from Brants's whistling rat by the pitch and length of its calls?
... that <b id="mwB5M"><a href="./Littledale's_whistling_rat" id="mwB5Q" rel="mw:WikiLink" title="Littledale's whistling rat">Littledale's whistling rat</a></b> can be distinguished from <a href="./Brants's_whistling_rat" id="mwB5U" rel="mw:WikiLink" title="Brants's whistling rat">Brants's whistling rat</a> by the pitch and length of its calls?