Yellow-Bellied Marmot, common in the Sierra mts. 3.5-11 pounds. Cute rodent,gets pretty round by fall, whistles to communicate warnings. Lives in burrows in the rocks. Feeding them human food is terribly unhealthy for them, please don’t. From Wikipedia:
Marmots reproduce when about two years old, and may live up to an age of fifteen years. They reside in colonies of about ten to twenty individuals. Each male marmot digs a burrow soon after he wakes up from hibernation. He then starts looking for females, and by summer may have up to four female mates living with him. Litters usually average three to five offspring per female. Marmots have a “harem-polygynous” mating system in which the male defends two or three mates at the same time.