High aerodynamic lift from the tail reduces drag in gliding raptors

0-10 secs: Five flights through the bubbles: (1) Northern Goshawk, (2-4) Tawny Owl, (5) Northern Goshawk 10-20 secs: The dynamic measured wake of a Tawny Owl. Tracked soap bubbles reveal the movement of the air behind a Tawny Owl (grey flying body). Bubbles are coloured by their vertical velocity (red-upward, blue-downward). 20 secs to end: A brief video explanation of the work