Where Banded Where Reported Shot 
Illinois Cuba, Ga., Ind., La., Mich., Tex., 
Wis. 
Ontario Ala., Ark., Fla., Ga., Ill., Ky., 
Mich., Mo., N.C. (2), Okla. Tenn. 
Michigan Ill. (3), Ind. (3), Ia., Kan.#, La., 
N.C., Okla., Ohio (2) 
Indiana Ala., Ill., La., Mich. 
Ohio Ark., Ill. (2), Ind. (2), Ky. (2), 
Mich., Miss., Mo., Okla (3), Ont., 
Pa. (2), Tex. (4) 
Quebec N.¥., Prince Edward Is., Vt. 
Massachusetts N.Y. 
Banding operations up through 1941 yielded 161 reports of 
birds being shot (5 of them in July were later excluded from life- 
table analyses), 7 reports of birds found dead, 6 found wounded, 7 
caught in mammal traps, 10 captured, and 15 reports of a vazue or 
indefinite nature. Of 102 birds shot in their first year of life 
(August 1 to July 31) and reported with definite recovery dates, 80 
per cent were apparently shot in the first 5 months. For 8 adults 
reported shot, this value was 56 per cent (table 35). It would seem 
probable that a life table based on this type of sampling would exag- 
gerate the mortality rate for the first year of life. 
Table 35.--Months in Which Marsh Hawks Were Reported Shot 
Age When Number Classified by Month Reported ‘Total 
Shot Vill IX X XI XII £ II It im VY Vi Vil Shot 
First Year 18 2116 19 12 6 & e dA 0 102 
Adult 33 9 10 2 3 bh 3 3 3 2 3 8 
Abridged life table 
A preliminary life table based only on birds shot is set 
up in table 36. The addition of 30 birds found dead or wounded or 
captured in various ways would not significantly change the mortality 
rates of 59 per cent for birds of the year and 30 per cent for adults. 
{A preliminary life table based only on these 30 would give a first- 
year mortality rate of no more than 67 per cent.) 
Age ratios and productivity 
Column 1, in table 36 implies that 135 adults are needed 
to raise 99 birds each year. This is an age ratio of the order of 
0.7 young (0.73) per adult or 1.5 young per pair alive on August l. 
While the occurrence of a single bird aged 16-17 in 
table 36 is a perfectly valid indication of the age which this 
species can and does obtain in nature, this single individual wuld 
8) 
