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As an exception, among polygynous primates, colobines as a group consistently exhibit a low level of sexual size dimorphism for unclear reasons. [22] Gibbons, on the other hand, are an example of monogamous primates that can be described as “monomorphic,” meaning males and females appear the same with little to no sexual dimorphism. [2]
Sexual dimorphism is the condition where sexes of the same species exhibit different morphological characteristics, including characteristics not directly involved in reproduction. [1] The condition occurs in most dioecious species, which consist of most animals and some plants.
In higher Primates, sexual dimorphism is also related to some aspects of the social organization and behavior (Alexander et al., 1979; [4] Clutton-Brock, 1985 [5]). Thus, it has been observed that the most dimorphic species tend to polygyny and a social organization based on male dominance, whereas in the less dimorphic species, monogamy and ...
Distinct sexual size dimorphism can be seen between the male and female gorilla. Sexual dimorphism is often exhibited in simians, though to a greater degree in Old World species (apes and some monkeys) than New World species. Recent studies involve comparing DNA to examine both the variation in the expression of the dimorphism among primates ...
Pygmy tarsiers exhibit low sexual dimorphism, so both sexes are similar in size and appearance. [7] The most noticeable feature of the pygmy tarsier are its large eyes, which are about 16 mm (0.63 in) in diameter. Unlike other nocturnal species, tarsiers lack a tapetum lucidum due to the diurnal evolutionary history of primates. [8]
Cantius also exhibits canine dimorphism, with males possessing relatively larger canine teeth than females. [4] Thus Cantius can be considered a sexually dimorphic species. Specifically, C. torresi lower canines clearly demonstrate sexual dimorphism in having a male/female [canine] length ratio that falls within the range of an expected ...
U.S. stocks closed higher as investors digested a slew of corporate earnings reports, including some from the so-called Magnificent 7. The broad S&P 500 index closed up 0.51%, or 31.86 points, to ...
The theory of sexual selection has been used to explain a number of human anatomical features. These include rounded breasts, facial hair, pubic hair and penis size. The breasts of primates are flat, yet are able to produce sufficient milk for feeding their young. The breasts of non-lactating human females are filled with fatty tissue and not milk.