Western Bluebirds are thrushes generally found in the western United States. These bluebirds can be found in open fields, or woodlands edges that are coniferous or deciduous. They will generally eat insects or berries. I saw this one at Kachina Wetlands in northern Arizona.
Mountain Bluebirds are thrushes that live in the western part of North America. Found in high elevation, open mountain meadows, and coniferous and deciduous forest areas. They are insect eaters. I photographed this one in northern Arizona.
Here is an American Robin eating worms off the road in my neighborhood. Learn more here: AMERICAN ROBIN