Yellow-crowned Bishop
... that when the male Yellow-crowned Bishop is ready to mate, his head and back turn a brilliant yellow color?
... that when the male <b id="mwEOo"><a class="mw-redirect" href="./Yellow-crowned_Bishop" id="mwEOs" rel="mw:WikiLink" title="Yellow-crowned Bishop">Yellow-crowned Bishop</a></b> <i id="mwEOw">(pictured)</i> is ready to mate, his head and back turn a brilliant yellow color?