Abstract
A population of pronghorn antelope ( Antilocapra americana ) at Sheldon National Wildlife Refuge in northwestern Nevada was observed during summer 1988 to determine activity budgets and social organization of males. Males spent more time running and walking and less time feeding during a 3-week period beginning in late August than they did earlier in the summer. Before late August, males scarcely interacted with each other or with females; during late summer, however, interaction rates increased. Males interacted significantly more often with females than with males. Five copulations were seen during late summer. Males were never observed defending an area. Instead, pronghorn antelope appeared to occupy undefended home ranges, and males defended harems of females.
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