A bird on the summit of Kala Patthar (5643 m) near Everest base camp

I found this bird on the summit of Kala Pattha over 5600 meters. The animal looked much better aclimitised than me. I had to spent more than 10 days walking through the Kumbu valley, with sleepless nights and horrible headaches to find a bird singing at the highest point in the trekking! at the time I said to myself: "what the fxxx is this animal doing here???" Incredible but true!