Heck, there are fish that change sex based on where they sit in the social (and size) hierarchy. That said, in many cases social position does result in physical changes. If you were to give an average male a false signal, indicating larger size, the male may do great for a while but tends to have the "bluff be called" eventually (if this didn't happen, the signal would tend to go away because of cheaters making it worthless) The calls give everyone an idea of how big they are without an actual fight occurring, which is good because fights are dangerous and energy expensive. It's not that dominant males start manifesting deep calls, it's just that the males that win fights have bigger bodies and therefore have deeper calls. Larger males often have deeper calls, because the pitch of a call is directly related to body size. So for example it's quite common for larger animals to be more dominant. I can't speak to orangutans specifically, but in many cases these physical traits aren't manifestations of dominance so much as they are indicators of overall ability to be dominant. You should be careful when thinking about causality here. I don't think we're clear on the mechanism, that is, why the dominant males will have more testosterone. The dominant males will have more testosterone, more colour and bigger balls. Mandrills, a kind of baboon, do have dominance related secondary sex characteristics. There are primates where dominance and appearance are related. I don't disagree with the post that says the size of cheek flanges is related to testosterone, but that is not necessarily related to dominance. I'll also point out that orangutans are a solitary animal, and I do not see how their cheek flanges would be related to dominance. He will then be on his own, or join a bachelor group, until he is big and strong enough to get his own females. When a male gorilla gets into late adolescence he will challenge the dominant male for control of the group and get kicked out as a result. The high crest and silver back, are secondary gender characteristics that develop in all fully adult male gorillas. However, that is because there will be only one fully adult male gorilla in a group. Your question is based on a false premise the common misconception that being a silverback is the product of being dominant in a group of gorillas.Īny family group of gorillas will have only one silverback. We make our world significant by the courage of our questions and by the depth of our answers. For more open-ended questions, try /r/AskScienceDiscussion | Sign up to be a panelist!.Looking for flair? Sign up to be a panelist!.Chris Ferrie, Science Books for Kids (and Adults!)Īsk Anything Wednesday - Engineering, Mathematics, Computer scienceĪsk Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, PsychologyĪskScience AMA Series: Viral Illnesses and Neurodegenerative Disorders Neil Theise, Consciousness and ComplexityĪsk Anything Wednesday - Physics, Astronomy, Earth and Planetary ScienceĪskScience AMA Series: Dr. Neuroscience, Neurology, Neurochemistry, Cognitive NeuroscienceĪsk Anything Wednesday - Economics, Political Science, Linguistics, AnthropologyĪskScience AMA Series: Dr. Medicine, Oncology, Dentistry, Physiology, Epidemiology, Infectious Disease, Pharmacy, Human Body Psychology, Cognitive Psychology, Developmental Psychology, Abnormal, Social Psychology Social Science, Political Science, Economics, Archaeology, Anthropology, Linguisticsīiology, Evolution, Morphology, Ecology, Synthetic Biology, Microbiology, Cellular Biology, Molecular Biology, Paleontology Mechanical Engineering, Electrical Engineering, Structural Engineering, Computer Engineering, Aerospace EngineeringĬhemistry, Organic Chemistry, Polymers, Biochemistry Mathematics, Statistics, Number Theory, Calculus, AlgebraĪstronomy, Astrophysics, Cosmology, Planetary FormationĬomputing, Artificial Intelligence, Machine Learning, ComputabilityĮarth Science, Atmospheric Science, Oceanography, Geology Theoretical Physics, Experimental Physics, High-energy Physics, Solid-State Physics, Fluid Dynamics, Relativity, Quantum Physics, Plasma Physics /r/AskScienceDiscussion: For open-ended and hypothetical questions.FAQ: In-depth answers to many popular questions.Weekly Features: Archives of AskAnything Wednesday, FAQ Fridays, and more!.Be civil: Remember the human and follow Reddiquette.Report comments that do not meet our guidelines, including medical advice.Downvote anecdotes, speculation, and jokes.Upvote on-topic answers supported by reputable sources and scientific research.Answer questions with accurate, in-depth explanations, including peer-reviewed sources where possible.Please read our guidelines and FAQ before posting
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