|Cliff Swallow Colony - Canon SX-50 HS - 215mm, f/6.5, 1/100 sec, ISO-800|
Thanks to a commenter on Facebook, Birds of Texas, indicating that, in addition to the plumage, the narrow-opening, gourd-shaped nests are also indicative of the species. Cave swallows make nests with more open tops. Danielle found this article on blog named Big Bend - Texas Nature which has some further description of the nests.
|Canon 60Da, EF 100-400mm f/4.5-5.6L with Kenko x1.4 - 560mm, f/9, 1/100 sec, ISO-800 (Flash)|