How did birds first take flight? There are several ideas of how this happened. The first known as the tree down hypothesis suggests that tree-dwelling birds flap their wings to cushion their landing.

The birds had since been displaced, and last week, a video shared to social media by Wild Animals Australia, an animal activist group, showed a flock of tree martins flying into shop front windows ...

Some of the birds were lying on the ground motionless, some were struggling to fly away, while others were “smashing into the windows” of the store and neighbouring shops. Tiny 15 gram tree ...