A snap shot: on this very hot summer day, the keepers had cooled down several of the indoor enclosures with ice and fans, resulting in the pandas resting indoors.
@john - Why is this puzzling? Endangered Species need help. There Endangered. There low on numbers and are in Breeding Programs. Most Carnivores are in indoor cages like these. But look at this:
Because an animal's rarity doesn't determine whether a certain set of living conditions is or is not acceptable.
Whether they're "run of the mill" or not is wholly irrelevant to this discussion. It is not their scarcity which determines their needs, but rather their zoology.