[Shawn E. Vincent] Sexual dimorphism is a common phenomenon among animals. The usual cause cited for sexual dimorphismr\n in animals is sexual selection acting through female choice or male-male combat... , "[M. T. Krueger] Sexual dimorphism is a common phenomenon among many different types of animals including peafowl,\r\n pheasants, humans, praying mantises, and others. It can be recognized in structural differences\r\n between the two genders in a species. These differences reflect the outcome of natural selection's\r\n actions relative to the roles of each gender... , "[Celina M. Takemura] Sexual dimorphism is an important source of intraspecific variability in biological species, and so\r\n virtually all studies in populational or interspecific levels need to take dierences among males and\r\n females into consideration... , "[Mylène LeBlanc] Sexual dimorphism is an important characteristic of many mammals, but little is known about how\r\n environmental variables may affect its phenotypic expression. The relationships between population\r\n size, body mass, seasonal mass changes, and sexual mass dimorphism were investigated using 22 years\r\n of data on individually marked bighorn sheep (Ovis canadensis) on Ram Mountain, Alberta. The number\r\n of adult ewes was artificially maintained low from 1972 to 1981 and then allowed to increase. The\r\n body mass of males from 0 to 7 years of age was negatively affected by population density...