Another Incident at Yellowstone

A few years back our whole family was in Yellowstone when my 16 YO son hollored "I need a camera". While he was standing at the edge of a river an elk came up behind him and was nudging in his pocket. I always have at least a half dozen cameras with me so that was his reason for the call for a camera. At that same spot we were going to have some sandwiches and my youngest (7) said look at these rocks Rich found. They crumble when you squeeze them. I informed them they were buffalo chips. They put their sandwiches down and went to wash I the river.