mountain trogon
... that the mountain trogon either excavates its own cavity nest by chewing into rotting wood or uses a pre-existing hole?
... that the <b id="mwAng"><a href="./Mountain_trogon" id="mwAnk" rel="mw:WikiLink" title="Mountain trogon">mountain trogon</a></b> <i id="mwAno">(male pictured)</i> either excavates its own <a href="./Bird_nest" id="mwAns" rel="mw:WikiLink" title="Bird nest">cavity nest</a> by chewing into rotting wood or uses a pre-existing hole?