This photo is from last year as well. The cliff swallows routinely nest under the bridge just before the main gate and whenever I heavy truck goes over the bridge they on mass, fly out from underneath. For a few minutes they circle from above to make sure it is safe to return to their nests so I set up on the bridge with my wide angle lens on a bright sunny morning and didn’t have to wait too long before a truck went past and I was able to catch them in flight with the mountain range in the background.