Some birds, like geese, can descend by ‘whiffling.’ This involves zig-zagging and sometimes turning completely upside-down to quickly plummet towards the ground.

Some birds, like geese, can descend by 'whiffling.' This involves zig-zagging and sometimes turning completely upside-down to quickly plummet towards the ground.
Some birds, like geese, can descend by 'whiffling.' This involves zig-zagging and sometimes turning completely upside-down to quickly plummet towards the ground.