Pop! goes the round-tailed ground squirrel.
Round-tailed ground squirrel (Xerospermophilus tereticaudus), at Papago Park, Phoenix, Arizona. These little imps have an oversized but distinguished name in Spanish: Ardillón cola redonda. For a second time I watched a mother squirrel chase away a much larger roadrunner that got too close to her burrow. I guess the behavior is not as remarkable as I first supposed.