In many locations we camped or visited during our trip there was a good chance to watch some Mountain Bluebirds. Quite often they forage from a perch, like a fence, twig, or rock. They drop down to the ground to catch insects but they also hover above their prey before they make a catch. Beside insects the bluebird takes also fruits and berries.
They like to keep their distance and many photos of Mountain Bluebirds I made during previous years had to be cropped. This female was perched on a young eastern cedar in our campground, just outside of Theodore Roosevelt National Park, North Dakota. The light was soft and the background far away, ideal for such an image.
Nikon D750, Sigma 150-600mm / f5-6.3 DG OS HSM S, @ 600 mm, 1/160 s, f/6.3, ISO250