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I think the idea is similar to thumb wrestling. They try to close their beaks on their opponent's beak. At which point they "win". Royal Terns fighting for the piling. |
Camera: NIKON D200 | ISO: 200 | Exp. bias: 0 EV | Exp. Time: 1/640s | Aperture: 11.0 | Focal Length: 340.0mm (=518mm) | Copyright: ©2008 J.M. Sowle |