Pursuing a Mallard

Fálki – Gyrfalcon – Falco rusticolus

I caught sight of this Gyrfalcon over the river yesterday. It is a young bird, probably a male. It is always exciting to see a Gyrfalcon and I was ready with my lens when it passed by at great speed. It was pursuing a Mallard on Ölfusá River, South Iceland. The chase was without the desired result.
Photo taken on Nikon D90, Nikkor 200-500mm, f 5.6, 500mm, 1/1250, ISO 800.