there being an estimated ten times more of them
... that the Siberian crane is considered more threatened than the whooping crane, despite there being an estimated ten times more of them?
... that the <a href="./Siberian_crane" id="mwA54" rel="mw:WikiLink" title="Siberian crane">Siberian crane</a> is considered more threatened than the <a href="./Whooping_crane" id="mwA58" rel="mw:WikiLink" title="Whooping crane">whooping crane</a>, despite <b id="mwA6A"><a href="./List_of_cranes" id="mwA6E" rel="mw:WikiLink" title="List of cranes">there being an estimated ten times more of them</a></b>?