Cooney Creek, Swan Valley, Condon, Montana, USA A Brook Trout circling a pair of Westslope Cutthroat Trout in the afternoon

Cooney Creek, Swan Valley, Condon, Montana, USA A Brook Trout consistently displaying territoriality against intruding Westslope Cutthroat Trout in the afternoon

Cooney Creek, Swan Valley, Condon, Montana, USA A Brook Trout assertively defending territory against encroaching Westslope Cutthroat Trout in the evening

Cooney Creek, Swan Valley, Condon, Montana, USA A Brook Trout persistently expelling a Westslope Cutthroat Trout out of its territory in the evening

Cooney Creek, Swan Valley, Condon, Montana, USA A Brook Trout vigorously chasing away an intrusive Westslope Cutthroat trout several times in the evening