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2. Controlling feral goats by shooting from a helicopter with and without the assistance of ground-based spotters;Bayne;Wildl. Res.,2000
3. Visual discrimination at varying distances in Spanish goats;Blakeman;Appl. Anim. Behav. Sci.,1986
4. Responses of mountain sheep to helicopter surveys;Bleich;Calif. Fish Game,1990
5. Studies of the Effects of Aircraft Noise on the Peri-partal and Post-partal Losses in Farm-raised Minks (Mustela vison);Brach,1983