Regulus bulgaricus
... that Regulus bulgaricus, the only fossil kinglet, is known from a single ulna?
... that <i id="mwA_E"><b id="mwA_I"><a href="./Regulus_bulgaricus" id="mwA_M" rel="mw:WikiLink" title="Regulus bulgaricus">Regulus bulgaricus</a></b></i>, the only fossil <a href="./Kinglet" id="mwA_Q" rel="mw:WikiLink" title="Kinglet">kinglet</a>, is known from a single <a href="./Ulna" id="mwA_U" rel="mw:WikiLink" title="Ulna">ulna</a>?