34 HB AGU DSB SOON Be bol ceie aes 
Richard Thom, Sr., and John Wilkins. Only birds that were seen within the 
forest boundaries were counted. The field trips were not uniform in the 
amount of spent; they ranged from as short as an hour to as long as sixteen 
hours. Nor did the trips cover an identical area each time. Only a very 
few trips were made in the large southern portion of the forest around 
Cliff, Indian, Rocky, and Stony Springs. The 160 acres in which the 
camping area is located and the big tree trail area were almost always 
covered. Because of these wide variations in the area covered, changes in 
the numbers of individuals of a species from trip to trip could not be 
compared. 
Instead of using density calculations, I calculated the seasonal fre- 
quencies of occurence of each species. Seasonal frequency may be defined as 
the number of times a species is seen during a season divided by the num- 
ber of trips made during that season. For example, the bobwhite was ob- 
served on eight spring trips out of a total of 11 trips taken during that 
season, giving this species a spring frequency, rounded to the nearest 
hundredth, of .73. Expressed another way, the bobwhite was observed on 
73% of the spring field trips. 
I arbitrarily considered the seasons to be: Winter (December, January, 
February); Spring (March, April, May); Summer (June, July, August); Fall 
(September, October, November). There were 14 Winter trips, 11 Spring 
trips, 25 Summer trips, and 7 Fall trips to the area. 
In the following list, all species that were seen on at least five separate 
trips are followed by their seasonal frequencies in the order of Winter, 
Spring, Summer, Fall. If the species was observed less than five times, the 
dates upon which it was seen are given. The numbers in parentheses in- 
dicate the number of individuals seen on those dates. The earliest recorded 
arrival date and the latest recorded presence of the species are given where 
this information is relevant. Records of the largest number of individuals 
are also given. 
The word “nest” is used when one nest of the species has been found. 
The use of the plural indicates that at least two nests have been found. 
Species reported as being “seen throughout the Summer” are those which 
probably breed in the forest, but for which no nest was found. 
A i fl ft 
BIRDS OF HIDDEN SPRINGS STATE FOREST 
Blue-winged Teal — 29 Aug. 63 (5), 8 Oct. 63 (5). 
Turkey Vulture — Seasonal frequencies: winter 0, spring .£5, summer .20, fall .14. Earliest 
seen, 1] Mar 66 (2). Latest seen, 6 Oct 63 (1). Seen throughout the summer. Five 
were seen on 15 May 65. 
Marsh Hawk — Seasonal frequencies: winter .36, spring O, summer .04, fall .57. None seen 
in June or July. 
Rough-legged Hawk — Seasonal frequencies: winter .29, spring O, summer 0, fall O. Earliest 
seen, 27 Dec. 63 (2). Latest seen, 8 Feb. 64 (1). 
Red-tailed Hawk — Seasonal frequencies: winter .64, spring .45, summer .40, fall .57. 
Seen throughout the summer. Six were seen on 29 Dec. 60. 
Sparrow Hawk — Seasonal frequencies: winter .21, spring O, summer .08, fall .29. Seen 
throughout the summer, 
Bobwhite — Seasonal frequencies: winter .29, spring .73, summer 1.0, fall .71. Young found. 
