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Articles 31 - 33 of 33
Full-Text Articles in Ornithology
Behavior Of Sandhill Cranes Near Power Lines Marked With Yellow Aviation Balls, Anne E. Morkill, Stanley H. Anderson
Behavior Of Sandhill Cranes Near Power Lines Marked With Yellow Aviation Balls, Anne E. Morkill, Stanley H. Anderson
Proceedings of the North American Crane Workshop
The principal known cause of mortality for wild whooping cranes (Grus americana) is collision with powerlines. Methods to minimize powerline collisions will contribute to the species' long term recovery. We studied the flight behavior of sandhill cranes (G. canadensis) near powerlines marked with yellow aviation balls near the Platte River, Nebraska, in 1988-90. An age ratio of 24 juveniles:76 adults of 84 carcasses found under powerlines was significantly different from typical population ratios of 12: 88 for this species. Two-way contingency table analysis of crane flight behavior data indicated that cranes avoided markers (P < 0.(01), reducing the potential for collision. Proximity ofpowerlines to habitats used by cranes (P < 0.001), wind speed (P < 0.05), and age of bird (P < 0.(01) were important factors contributing to crane collisions with powerlines in Nebraska. Details are available in Wildl. Soc. Bull. 19(4):442-449.
Behavior Of Whooping Cranes During Initiation Of Migration, Thomas V. Stehn
Behavior Of Whooping Cranes During Initiation Of Migration, Thomas V. Stehn
Proceedings of the North American Crane Workshop
Whooping cranes (Grus americana) observed immediately before the initiation of migratory flights exhibited increased alertness, wing ruffling, and head tilting. Seven observations at Aransas National Wildlife Refuge (NWR), Texas, indicate that the departure of 1 group of whooping cranes may influence other nearby cranes to start migration, even though later departing groups may fly separately.
Determinants Of Variation In Avian Mobbing Behavior, Charles Ray Chandler Jr.
Determinants Of Variation In Avian Mobbing Behavior, Charles Ray Chandler Jr.
Biological Sciences Theses & Dissertations
Using three combinations of two experimental stimuli, I initiated mobbing behavior in various species of birds. The objectives of this research were to test the effects of stimuli on mobbing, the predictions of the hypothesis that mobbing functions to drive a predator away, and the effect of other species and individuals on the mobbing behavior of a bird. Mobbing experiments were conducted in a variety of habitats and locations from January 1983 through February 1984.
Only 6.5% of all trials with the mount-only stimulus were successful in attracting birds. Tape-only and mount-and-tape stimuli were equally effective in attracting birds, but …