The Cliff Swallow (Petrochelidon pyrrhonota) is a stocky swallow with a square tail. It is distinguished by a pale buffy rump and dark throat. Like all swallows, they feed exclusively on insects captured in flight. This species is a summer resident.
Cliff Swallows nest mostly on manmade structures such as under bridges. The nest is gourd-shaped mud cone with a narrow entrance. The nest in tightly packed clusters in large colonies. If a colony is destroyed they will probably be abandon the site. However, they will adapt to artificial nests and this can be used as an effective mitigation technique. Swallows normally need 40-43 days to lay eggs and raise young after nest construction.
Swallows nest under the bridge over the water but they nest of Cliff Swallows are more readily seen on the bridge nearby under the interstate.