Penguins from Harbin Polarland, an arctic-themed aquarium in the north-eastern Chinese city, were brought to a nearby outdoor enclosure on Sunday for a promotional event during the city's annual Ice Festival.Video source: VCGWith temperatures at around minus 15 degrees centigrade, 6 Gentoo penguins were released for 15 minutes into the outdoor enclosure. There, they walked and slid on snow and