What would you do if you went hiking and came face-to-face with a massive grizzly bear and her two curious cubs?

Two-year-old twin polar bears Kallik (pronounced Kah-LEEK), left, and Kallu (Kah-LOO) take a swim during their public debut ...

Kallik and Kallu made their public debut at the St. Louis Zoo on March 25. Kallik and Kallu: The twin polar bear brothers are ...

Aside from their world-famous geysers, Yellowstone is renowned for its diverse populations of wildlife, especially its ...