Though the family initially thought it was a dog swimming in the lake ... RELATED VIDEO: Mother Bear Rescues Baby Cubs In South Lake Tahoe "We knew that if we didn't do something, we are pretty ...

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

A video on Instagram shows the mother bear stepping into the pool and swimming as her two cubs watch her by the edge Gabrielle Rockson is a staff writer-reporter for PEOPLE. She joined PEOPLE in ...