Bill Hubick Photography - Cliff Swallow (Petrochelidon pyrrhonota)

A cooperative Cliff Swallow at Piney Reservoir, Garrett Co., Maryland (4/30/2011). Photo by Bill Hubick.

Above and below two: A cooperative Cliff Swallow at Piney Reservoir, Garrett Co., Maryland (4/30/2011).

A cooperative Cliff Swallow at Piney Reservoir, Garrett Co., Maryland (4/30/2011). Photo by Bill Hubick.

Below: Several of the 40 active Cliff Swallow nests on a Carroll Co. bridge (6/17/2007).

Several of the 40 active Cliff Swallow nests on a Carroll Co. bridge (6/17/2007). Photo by Bill Hubick.

Below: A comparison of Barn Swallow (left) and Cliff Swallow (right) - Garrett Co., Maryland (4/30/2011).

A comparison of Barn Swallow (left) and Cliff Swallow (right) - Garrett Co., Maryland (4/30/2011). Photo by Bill Hubick.

Below: A comparison of Cliff Swallow (left) and Tree Swallow (right) - Garrett Co., Maryland (4/30/2011).

A comparison of Cliff Swallow (left) and Tree Swallow (right) - Garrett Co., Maryland (4/30/2011). Photo by Bill Hubick.

Below: Photos from the western U.S. - Cliff Swallows taken at the "Great Saltair" on the Great Salt Lake in Utah (6/21/2005).

Photos from the western U.S. - Cliff Swallows taken at the "Great Saltair" on the Great Salt Lake in Utah (6/21/2005). Photo by Bill Hubick.