Precocious breeding by yearling Giant Canada Geese

RONALD D. DROBNEY,14 J. MICHAEL CHECKETT,2 JOHN M. COLUCCY,2 AND DAVID A. GRABER3 'United States Geological Survey, Biological Resources Division, Missouri Cooperative Fish and Wildlife Research Unit, University of Missouri, Columbia, Missouri 65211, USA; 2Missouri Cooperative Fish and Wildlife Research Unit, The School of Natural Resources, University of Missouri, Columbia, Missouri 65211, USA; and 3Missouri Department of Conservation, 1110 South College Avenue, Columbia, Missouri 65201, USA