Why Do Penguins Wear Tuxedos?
10,000 Birds
SEPTEMBER 15, 2011
They have special adaptations to stay warm and to keep their eggs and chicks warm. However, we now know that human ancestors became upright first, and were bipedal for millions of years before they started to use tools extensively, and then another million years went by before their brains started to evolve a significantly larger size.
188 
Let's personalize your content