Evolving Humanity

Evolving Humanity - Sexual dimorphism: differences between...

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Evolving Humanity Human Nature : Behavior : bipedalism, language, tool-use, symbolic culture Thinking (cognition): reasoning about “unobservables”, logic, math, and religion Physiology (body): large brains, ‘gracile’ or thin bodies, hairless, generalist physiology The Human Primate We share many physiological and behavioral characteristics with almost all primates, humans are part of the primate order. Shared characteristics include forward facing eyes, color vision, greater reliance on vision than smell, opposable thumbs, five digits, greater reliance on prehension, no claws, give live birth, care for young, long gestation periods, long post-natal development, large group size, hierarchies, group “politics” Catarrhines Greater behavioral and morphological diversity than new world monkeys Greater ecological range: live in many different ecosystems
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Unformatted text preview: Sexual dimorphism: differences between males and females of same species Hominoids (apes): lack of a tail, large body size. Compared with monkeys: larger brain relative to body size, more flexible cognitive and behavioral repertoire, elaboration of social structure. Hominins Australopithecus afarensis : Lucy. Found in Tanzia, Central Africa and South Africa. Believed to have large sexual dimorphism. Size small relative to humans. Shows signs habitual bipedalism. Homo habilis : large brain, short and broad cranium, human like teeth. Used oldowan tools. Homo rudolphensis : larger brain, large teeth, used oldowan tools. More human like proportions. Homo erectus : first species that leaves Africa. Used Acheulian tools, associated with controlled fire and navigation....
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