. Bulletin. Natural history; Natural history. 300 Illinois Natural History Survey Bulletin Vol. 33, Art. 3 were made from plots on highway maps, which later were found to have a 7-per- cent scale error. Adjustment for this er- ror brings their mean airspeed down to about m/s, but this is still 20 per- cent higher than the m/s mean for the airspeed estimates we now report. A species-by-species comparison be- tween the two studies shows the mean airspeeds of Cochran et al. '1967) to be higher by 16, 39, and 25 percent for Swainson's, veery, and gray-cheeked. Fig. 1. - (Above) Swainson'
. Bulletin. Natural history; Natural history. 300 Illinois Natural History Survey Bulletin Vol. 33, Art. 3 were made from plots on highway maps, which later were found to have a 7-per- cent scale error. Adjustment for this er- ror brings their mean airspeed down to about m/s, but this is still 20 per- cent higher than the m/s mean for the airspeed estimates we now report. A species-by-species comparison be- tween the two studies shows the mean airspeeds of Cochran et al. '1967) to be higher by 16, 39, and 25 percent for Swainson's, veery, and gray-cheeked. Fig. 1. - (Above) Swainson's thrush carrying a radio transmitter of the type currently in use (Cochran 19801 (Below) a transmitter of the type used in the study reported in this paper. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
