1. Canadian Wildlife Service, Environment Climate Change Canada , Ottawa, Ontario , Canada
2. Department of Biology, Carleton University , Ottawa, Ontario , Canada
3. Birds Canada , Port Rowan, Ontario , Canada
4. Wildlife Research Division, Environment Climate Change Canada , Montreal, Québec , Canada
5. National Audubon Society , New York, New York , USA
6. Wildlife Research Division, Environment Climate Change Canada , Ottawa, Ontario , Canada