On Friday a.m., September 22, 1911, a flock of Broad Winged Hawks (Buteo latissimus Wils.), remarkable for its size and compact character, passed about two miles north of Cedar Rapids, Iowa.
Proceedings of the Iowa Academy of Science
©1912 Iowa Academy of Science, Inc.
Bailey, B. H.
"A Remarkable Flight of Broad Winged Hawks,"
Proceedings of the Iowa Academy of Science, 19(1), 195-196.
Available at: https://scholarworks.uni.edu/pias/vol19/iss1/37