TOKYO (CNN) -- Sticky summer heat is hanging over Japan this time of year -- and humans aren't the only ones seeking ways to cool off. In Tokyo's Ueno Zoo, polar bears, penguins and other cold-climate animals are having a tough time, but zookeepers are helping their charges beat the heat by bringing in blocks of ice. The reception so far is chilly -- pleasantly so.

Photos/Caption info: TV Asahi