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e Behavioural Trait o Complex sociality o Minor exception, major characteristic o None show the degree of complexity e The two major life history traits of primates e Single offspring (exception: some primates give birth to twins) / most other mammals *not primates* give birth to many cats. o — kselected: having very few babies in a life but mother gives a lot more energy and time in every one of babies. Long infantile and juvenile period in such species. Female chimpanzee 1 baby every 5 years o — rselected: many offspring. Parents spend less time. Increases the chance that some will survive to reproduce. Rabbits maybe 12 a year o Extended ontogeny (development stages in the growth of individuals) o — primates don't stand out in life span compared to humans. In mammals humans live longest and elephants. o — birds vultures live 120 years.. what the fuck. o — inreptiles turtles live 150 years o — ontogeny has 4 stages (gestation, infantile, juvenile, adult) check graph on powerpoint. Rabbits, giraffes and bears represent typical mammalian patterns. Juveniles 15% ) Among primates, our juvenile takes up 30% of our lives and only 60% as adults).- this is due to high degree of euphenzilation. We primates need longer infantile and juvenile periods just to grow to the stage of development where most of the other mammals are born! And due to learning period we learn from outside stuff instead of being hardwired) e The one all-important behavioural trait. o Complex sociality o Advantage? Check ppt 4.1 e Altricial and precocial species o Altricial = babies born underdeveloped and dependent on mothers. Like birds