LISLE ARBORETUM CHRISTMAS BIRD COUNT
Party Hours and Party Miles: Examples



Below you'll find some examples of the complilation of party miles and party hours. In this example, we have

  • sunrise at 7:09 a.m.
  • sunset at 4:42 p.m.

Since "official daylight birding time" is one half hour before sunrise to one half hour after sunset, in this example we have

  • official daylight time from 6:39 a.m. through 5:12 p.m.

All other times are recorded as "owling hours."


Birding Group #1:

Four persons began birding together at 6:40 a.m. and continued until 5:10 p.m. They walked seven miles in six hours and drove 78 miles in four hours; they took a half hour lunch break.

Results: 10 birding hours (6 on foot, 4 by car); 85 party miles (7 on foot, 78 by car); in 1 party.


Birding Group #2:

Three persons began birding together at 7:00 a.m. and continued until 3:00 p.m. They walked three miles in five hours and drove 62 miles in three hours. They did not take a lunch break, but birded while eating lunch.

Results: 8 birding hours (5 on foot, 3 by car); 65 party miles (3 on foot, 62 by car); in 1 party.


Birding Group #3:

One person birded from 6:40 a.m. until 5:10 p.m. He walked 12 miles in 10 hours and drove five miles in one half hour. No lunch break.

Results: 10 1/2 birding hours (10 on foot, 1/2 by car); 17 party miles (12 on foot, 5 by car); in 1 party.


Birding Group #4:

Two persons began birding at 8:00 a.m. and were joined by a third (who had not birded in the morning) at 1:30 p.m. All three continued together until 4:30 p.m. (However, the first two took a 1 1/2 hour lunch break.) They walked three miles in four hours and drove 73 miles in three hours.

Results: 7 birding hours (4 on foot, 3 by car); 76 party miles (3 on foot, 73 by car); in 1 party.


Birding Group #5:

Four persons began birding at 8:00 a.m. and were together until 9:30 a.m., then split up into two groups ot two each until 11:00 a.m. when they rejoined. All continued together until 5:00 p.m. when they stopped birding. As a group of four they walked five miles in 5 1/2 hours and drove 24 miels in two hours; while split up, the first two walked an additional 1 1/2 miels in 1 1/2 hours and the second two walked two miles in 1 1/2 hourse; there was no driving while the groups were separated.

Results: 10 1/2 birding hours (8 1/2 on foot, 2 by car); 32 1/2 party miles (8 1/2 on foot, 24 by car); in 1 to 2 parties.


Birding Group #6:

This example includes owling hours.

Two persons began birding at 3:40 a.m. (three hours before official daylight time) listening for owls, etc. They continued birding all day together and finally stopped at 7:10 p.m. (two hours after official daylight time). These two persons walked 12 miles in 9 1/2 "daylight" hours and drove 36 miles in one "daylight" hour; they also spent three early morning hours and two evening hours listening for owls.

Results: 10 1/2 birding hours (9 1/2 on foot, 1 by car); 48 party miles (12 on foot, 36 by car). 5 owling hours; in 1 party.


Birding Group #7:

This example combines owling hours and split party hours.

Three persons began birding at 1:40 a.m. and continued until 10:10 p.m. At 7:40 a.m. they split into three separate parties then rejoined just after noon. They then split into three parties again at 1:40 p.m.; two joined up at 3:10 p.m. and the third rejoined the two at 4:40 p.m. They remained together the rest of the time. As a group of three they walked two miles in 1 1/2 hours (6:40 - 7:40 a.m. and 4:40 to 5:10 p.m.) and drove five miles in 1 1/2 hours (12:10 p.m. to 1:40 p.m.). The group of two walked two miles in 1 1/2 hours (3:10 to 4:40 p.m.) As individuals, the first person walked seven miles in six hours (7:40 a.m. to 12:10 p.m. and 1:40 to 3:10 p.m.); the second walked eight miles in six hours (the same hours as the first); and the third walked 10 miles in 7 1/2 hours (7:40 a.m. to 12:10 p.m. and 1:40 to 4:40 p.m.). All driving was done while the three persons were together.

Results: 24 birding hours (22 1/2 on foot, 1 1/2 by car); 34 party miles (29 on foot, 5 by car); plus an additional 10 owling hours; in 1 to 3 parties.


Totals:

Combining everything together gives us the following.

  • 20 persons in a minimum of 7 parties and a maximum of 10 parties.
  • 80 1/2 total party hours, with 65 1/2 on foot and 15 by car
  • 357 1/2 total party miles, with 74 1/2 on foot and 283 by car.
  • 15 total owling hours.



Last modified on 9 November 2015
by Geoffrey A. Williamson