We see only a tiny fraction of a bird's existence. There is a huge amount of its life that we have no knowledge of. I hope this series will enable people to get inside the mind of a bird. There are birds far out on the open sea. Birds go to the poles, and survive extremely low temperatures.
Birds go underwater.
They have been seen diving to 1000 feet. Birds have colonised the air in a fantastic way. They even fly over the Himalayas. Swifts stay on the wing nearly all their lives, making nests of bits of fluff they catch in the air. They even mate in the air.