LifeLosing their dino tail limited size of flightless birds As birds evolved from theropod dinosaurs, they lost their tails and had to crouch for balance. This kept their legs and therefore their size small ¿ìè¶ÌÊÓÆµ
LifeWolves turned into dogs by European hunter-gatherers European hunter-gatherers were the first to bring dogs to heel, perhaps as early as 32,000 years ago ¿ìè¶ÌÊÓÆµ