gape
... that the gape of nestlings of several passerine bird species have been shown to be conspicuous in the ultraviolet spectrum?
... that the <b id="mwHCQ"><a class="mw-redirect" href="./Gape" id="mwHCU" rel="mw:WikiLink" title="Gape">gape</a></b> of nestlings of several <a href="./Passerine" id="mwHCY" rel="mw:WikiLink" title="Passerine">passerine</a> bird species have been shown to be conspicuous in the <a href="./Ultraviolet" id="mwHCc" rel="mw:WikiLink" title="Ultraviolet">ultraviolet</a> spectrum?