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The songs of two species of wrens, Thryothorus sinaloa and T. felix, are less similar than previously believed. We have found that song structure, bout patterning, and other aspects of singing behavior are widely divergent between the two species, which are sympatric over much of their ranges....
An investigation of the behavior and ecology of several contiguous harems of yellow-bellied marmots (Marmota flaviventris) was conducted in an alpine area of North Pole Basin, Gunnison County, Colorado. At an elevation of 3,400 m, the study site differed from those of previous marmot...
Three species of red-breasted meadowlarks (Aves, Icteridae, Sturnella) coexist on the pampas of southern Buenos Aires Province, Argentina. The species differ somewhat in size and shape but have very similar color patterns.
In the nearly homogeneous habitat provided by wheat fields,...
The mating system of prairie voles (Microtus ochrogaster) was investigated by experimentally manipulating the sexual composition of vole societies, thereby providing each vole with a variety of mating choices.
In male-female pairs, both parents appeared to contribute equally to the...
Many insects stridulate when they are handled or attacked. It has been suggested that this disturbance stridulation acts to deter predators. This hypothesis was investigated in a series of experiments. Predators were given insects which had been silenced by disruption of their...
Young pigeons were kept in an aviary from the time of weaning until the time of displacement 3–5 months later. The two compartments of the aviary were differentially shielded by surrounding walls, and birds of both compartments were released simultaneously. During six years, seven types of...
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