SHORT COMMUNICATIONS 
799 
FIG. 1. Historic and currently occupied Black Swift breeding colonies and data logger placement sites in the western 
United States. 2006-2010. 
at a site in Colorado including arrival at the colony, 
egg laying, incubation onset, hatching, and Hedg¬ 
ing (Hirshman et al. 2007). We divided C alifomia 
data into phenology periods previously published 
lor this site (Foerster 1987. Schultz and Levad 
2003). A 1-hr period in the afternoon (1500- 
1600 hrs). considered the warmest time of day. and 
a 1-hr period in the morning (0500-0600 hrs). 
considered the coolest time period were used for 
temperature comparison during each 24-hr period. 
RESULTS 
Thirty of 42 data loggers placed in Colorado 
and New Mexico produced 17,826 usable records. 
The two data loggers at the California site 
produced 1,355 usable records. 
Season-long (31 May to 7 Oct) median ± SD 
temperatures and RH at Colorado and New 
Mexico sites were 9.4 ±3.5 C (range = 
0.11-26.2 °C, n = 17,826) and 89.7 ± 13.5% 
(range = 23.5-100%, n = 17,826). respectively 
