Sexual dimorphism describes the morphological, physiological, and behavioral differences between males and females of the same species. Most primates are sexually dimorphic for different biological characteristics, such as body size, canine tooth size, craniofacial structure, skeletal dimensions, pelage color and markings, and vocalization. Sexual dimorphism can manifest itself in many different forms. In male and female primates there are obvious physical difference such as body size or canine size.
Understanding Sexual Dimorphism
What is chimpanzee sexual dimorphism? - Answers
Sexual dimorphism largely results from sexual selection see handout. It is easy to understand how natural selection can favor longer legs and sharper fangs in animals. It is difficult to understand why selection would favor the male peacock's tail. Examples of sexual dimorphism slides : Elephant seals males much larger than females ; baboon canines male canine twice as large as female's ; cottontop tamarin females slightly larger than males ; male lizard throat sack; polyandrous phalaropes females have brighter plumage than males ; uakari and mandrill males in both species brightly colored ; bower bird male builds bower to attract female ; human haircuts and ornamentation. Darwin proposed that sexually dimorphic characteristics are related to a critical hostile force: mate shortages.
Philippine eagle – the largest eagle in the world
Biology Stack Exchange is a question and answer site for biology researchers, academics, and students. It only takes a minute to sign up. For example, "one-arm pull strength is pounds for male chimps and pounds for female chimps". In fact, the Excel spreadsheet given in supplementary materials shows there were two males and three females, tested in three sessions; in each session weight and pull strength were listed. The ratios of max pull to weight for males were 3.
Sexual dimorphism is the difference in morphology between male and female members of the same species. Sexual dimorphism includes differences in size, coloration, or body structure between the sexes. For example, the male northern cardinal has a bright red plumage while the female has a duller plumage. In most cases, when size differences exist between the male and female of a species, it is the male that is the larger of the two sexes. But in a few species, such as birds of prey and owls, the female is the larger of the sexes and such a size difference is referred to as reverse sexual dimorphism.