Here is an American cliff swallow colony, at sunrise. This photo is a close up, detailed shot, showing the species (Petrochelidon pyrrhonota) in their mud nests, which they build high up on sheer surfaces, away from predators, and close to their feeding grounds.
I'd seen the swallows a few times throughout the trip, but the conditions were never right; always very windy, harsh lighting, and so forth....then on the last day of my trip, I got up early to be on location at sunrise, and was rewarded with this golden light.
The first photos I took were from a distance, near the road. Then I slowly made my way up the steep and rocky slope, carrying my tripod/gimbal + 500 f4 + 1.4x in one hand, using my free hand to grasp at rocks and bushes to aid in climbing. I allowed the birds to adjust to my presence, taking closer and closer photos of the colonies over a period of 20 minutes. Higher up the slope, it got rather windy, which catches the 500mm like a sailboat on the high seas.
All of the effort and planning was worth it, to get this image, exactly as I'd envisioned it. Hopefully you enjoy it as well.