Looks similar to a robin. Blue and rust coloring white vent and belly.
Maricopa County, Arizona
They don't grow arms until they hit 75.
Lots of these around. I took a picture of one of the smaller ones.
Spotted this at the beginning of the hike. I liked the reddish-purple color.
Very fun to see these in person.
Being thorny may be a requirement to grow in the desert.