I've seen my share of birds at 10500 in the Utah mountain areas. You just try to keep an eye out for them in the summers. I took off from a runway and there must have been some seaguls in the field to the left and end of the runway. I was about 100 feet off the ground and these things just were everywhere, I got lucky and didn't get hit. Lots of seagulls flyin around is kinda freaky, never seen birds maneuver like that before...