which numbers 12–13 thousand
... that the Piping Plover, which numbers 12–13 thousand, has its very own census?
... that the <a class="mw-redirect" href="./Piping_Plover" id="mwELg" rel="mw:WikiLink" title="Piping Plover">Piping Plover</a>, <b id="mwELk"><a href="./List_of_Charadriiformes_by_population" id="mwELo" rel="mw:WikiLink" title="List of Charadriiformes by population">which numbers 12–13 thousand</a></b>, has its very own census?