Abstract
Fulica americana, studied in relation to other waterfowl breeding on the Malheur Refuge, eastern Oregon, proved more pugnacious than most other waterfowl there. They appeared to resent birds of other spp. (as well as other coots) entering their nesting territories and this territory guarding habit may be a factor in reducing the area of suitable nesting territories for other waterfowl. The coot territory guarding extends through much of their brooding season and may be a factor in limiting feeding of certain other waterfowl broods. Little evidence of coot predation on other waterfowl was located.

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