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Full-Text Articles in Animal Sciences
Bird Hybrids In The Kettle Moraine, Millicent S. Ficken
Bird Hybrids In The Kettle Moraine, Millicent S. Ficken
Field Station Bulletins
Since hybridization in birds is so rare in nature, it is unusual to have the opportunity to study what happens when two species interbreed. Blue-winged Warblers (Vermivora pinus) and Golden-winged Warblers (V. chrysoptera) produce hybrids wherever they occur together. Furthermore, such hybrids are fertile and there is pairing between these hybrids and both parental species. When we learned that both species breed in the northern Kettle Moraine State Forest, we decided to see what sorts of interactions between the two species were occurring there. Our objective initially was to determine if pairing was random between the species, e.g. were Blue-wings …
In Quest Of The Elusive Ovenbird, Charles M. Weise
In Quest Of The Elusive Ovenbird, Charles M. Weise
Field Station Bulletins
The Ovenbird was selected for intensive study at the UWM Field Station for a variety of reasons. First, it is closely adapted in all respects-morphological, physiological, behavioral- to the upland forest environment, reaching maximum numbers in climax forests, such as the maple-beech forest which is under special investigation at the station. Second, because of its song it can be accurately censused and annual variations in numbers can be detected. Third, unlike most of the hard-wood forest birds, which spend most of their time in the tree canopy, the Ovenbird both nests and feeds on the ground, thus making it more …
Winter Bird Studies At The Uwm Field Station, Charles M. Weise
Winter Bird Studies At The Uwm Field Station, Charles M. Weise
Field Station Bulletins
The winter trapping program was begun in the winter of 1965-66 and was expanded and conducted more systematically in 1966-67 and 1967-68. The primary objective has been to determine accurately the daily and seasonal changes in body weight and depot fat in the Chickadee and Junco. Secondarily, we (my students and I) have been interested in the winter population densities of these birds, their organization into social groups and flocks, their movements and range of activity in the local area.