Another favorite toy is the firehose cube. Sometimes he treats it like prey, stalking and sneaking up, then attacking. Sometimes he grabs it in his mouth, and swings his head wildly to throw it into the air, then dives in and retrieves it under water.
So the two of them spent their day playing in the sun, mostly separately, but then coming together for a little family fun.
The slanted afternoon sunlight on an autumn day sometimes gives the bears' fur a lovely glow, and throws sparkles onto the water. It was nice to be in a zoo again, with my camera, enjoying the antics of a sweet polar bear cub.