This is actually an Abert squirrel ... not the Albert squirrel as I misidentified it at the time. The Abert's squirrel, of which there were many in the park, is generally begging for food - perhaps the source of my confusion. The Abert's squirrel is named after Colonel John James Abert, an American naturalist and military officer who headed the Corps of Topographical Engineers and organized the effort to map the American West in the 19th century. It was not named for the absent Albert.