Chapter VII.--Order Falconiformes: Vultures, Hawks, and 
Their Allies (Family Accipitridae: Hawks 
and Eagles) 
Marsh Hawk 
Literature on Productivity and Survival 
Merrill C. Hammond and C. J. Henry (1949) have compiled 
some very pertinent nesting statistics on Circus Gyaneus. In North 
Dakota, 60 clutches were observed to average 5.1 eggs in number; }3 
nests with young were found to hatch an average of 1.1 young; and 
3.2 birds fledged from 11 nests. The age at which the birds breed 
is not known with certainty. 
Banding work in North America 
Young marsh hawks have been banded by 108 persons whose 
work was represented by recoveries in the files of the Fish and 
Wildlife Service at the time of this study. I did not ascertain 
the number of persons who banded birds of this species but failed 
to get recoveries. The recovery reports that I examined originated 
from 6 Canadian provinces and 21 states in the United States. The 
more important banders were W. R. Salt of Alberta, C. J. Henry and 
M. CG. Hammond of North Dakota, C. E. Holcome of Illinois, and L. W. 
Campbell of Ohio. Passage birds, adults, ami young tethered for 
experiments were excluded in this inventory. 
Characteristics of the sample Studied 
The dispersal and migratory tendencies of this species may 
be seen in the following tabulation of birds reported shot (# means 
that the band was sent in to the Fish and Wildlife Service; # means 
that I could not locate the letter supporting the record): 
Where Banded Where Reported Shot 
Alberta Id., Wash., Wyo. 
Saskatchewan La., Mo., Okla. (3), Tex. (4), Wash. 
. Manitoba N.D. 
Utah Ariz. 
Colorado TOX. 
Wyoming Calif. 
North Dakota B.C., Kan., La. (2), Mexico, Mo., 
ae Tex. (7) 
South Dakota Colo., Las, Mo. (2), Okla. (2) 
Minnesota Cuba, Ia., La., Mo., Okla., Tex. (3) 
Wisconsin Ark., Ill. (4), Ind., Kan. (2), Ky., La. 
4 ie 3), Miss., Mo., Neb.#, Tenn., Tex. (2) 
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