#27 Because they play team sports in the air.
It’s true, I witnessed this myself a few years ago. Hiking in a windy valley I saw 8 or 9 crows flying and swooping high above me, chasing each other. I stopped to watch and realized they weren’t just randomly flying, they were playing catch with a pine cone! One crow would fly above the other crows with the pine cone in its feet until he saw one of his teammates below him open to catch it. Then he’d drop it into the wind and his team mate would scoop it out of the air and the chase would start all over again.