Savannah Hypothesis - Africa became hot and dry so trees started to disappear, being upright allowed hominins to see predaors in the grass, Thermoregulation - Being upright reduces surface area exposed to sun and increases surface area exposed to wind, Postural Feeding Hypothesis - Being upright while in trees allowed some hominins to outcompete others for food gathering, Provisioning - Being upright while in trees allowed some hominins to gather more food and gift it to mates increasing reproductive chances, Efficiency - Bipedal locomotion is more energy saving than quadrupedal movement on the ground, Freeing of Hands - Becoming bipedal allowed hominins to pick up and use simple tools,

Bipedalism Selection Pressures

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