SHORT COMMUNICATIONS 
157 
related to their exploitation of habitats and non- 
uniformly distributed types of aerial insect prey not 
as intensely used by other species. This may he 
viewed as forms of resource partitioning allowing 
coexistence of otherwise similar species of aerial 
insectivores (Waugh and Hails 1983, Collins 
2000). Additional attention needs to be given to 
the food and foraging of these and other swifts to 
confirm the interpretations presented here. 
ACKNOWLEDGMENTS 
I am grateful to Gonzalo Medina P. for permission to 
conduct studies of swifts in Henri Pittier National Park and to 
Robert Smice and Robert Waggenstein for identification of 
the prey items. Michael K. Tarburton, two reviewers, and the 
editor made helpful suggestions which improved an carls 
draft of this manuscript. The field portions of this study could 
not have been conducted without the participation and 
cheerful companionship of the late Betsy Trent Thomas. 
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