Cliff Swallow <i>Petrochelidon phyrrhonota</i>, juvenile, Great Salt Lake, Utah. When young Cliff Swallows leave their nests they congregate in large groups called creches. A pair of swallows can find its own young in the creche primarily by voice. Cliff Swallows have one of the most variable juvenile plumages, and the distinctive facial markings may help the parents recognize their chicks by sight too. Reference &lt;a href="<a rel="nofollow" class="external free" href="http://www.allaboutbirds.org/guide/Cliff_Swallow/lifehistory">http://www.allaboutbirds.org/guide/Cliff_Swallow/lifehistory</a>" rel="nofollow"&gt;www.allaboutbirds.org/guide/Cliff_Swallow/lifehistory&lt;/a&gt;
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/32541690@N02">Alan Vernon</a>
CC BY 2.0
<a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/32541690@N02/3857985780">Juvenile Cliff Swallow</a>