Cave Swallow <i>Petrochelidon fulva</i>, Bentsen-Rio Grande State Park, Hidalgo county, TX. One in a massive swarm of over 300 birds, including about 10 Barn Swallows and about 5 Tree Swallows.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/46812934@N04">logan kahle</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/46812934@N04/8187010428/">Cave Swallow</a>