TABLE 23 
Mortality table by months of nestings of the Prairie Horned Lark at Evanston, IIl., 1926 
No. of 
Per Cent Nestlings Nestling P N Cent of | Total No. Total Loss Per Cent 
Egg Loss om Eggs and Eggs and 
Month gas Within of Egg Loss Bape Loss Nestlings Nestlings Total Loss 
March 4 4 1,000 0 0 0 4 4 1.000 
April 44 9 . 204 30 6 . 200 74 15 . 202 
May 28 3 .107 23 6 . 260 51 9 .176 
June 26 3 115 20 9 .450 46 12 . 260 
July 6 2 .333 8 5 625 14 7 . 500 
TABLE 24 
Mortality table of nestings of the Prairie Horned Lark for 1927 at Ithaca, N. Y. 
Nest No, Inclusive Dates* phy fez Cause seni ci phe: Cause + she 
Bi March 15—31 | 3 0 | 3 3 Low temperature........| 0 
Ai March 19—April 1.......... 2 2 Snow 0 0 
B2 April 8—-May 2.........058. 4 0 4 3 Low temperature 1 
Dd April 8—April 19............ 3 3 Cultivation 0 
Cc April 21—May 15........... 5 0 5 2 Unknown 1, Expos.1... 3 
As April 22—May 16........... 3 0 | | 3 0 a 
Total | 20 5 | | 15 | 8 7 
*First date in each case is estimated. 
uoyonpo.day 
IIl 
