Freezing in the cold

One afternoon in the Arctic, a father polar bear and his son polar bear were sitting in the snow. The son polar bear turned to his father and asked, "Dad, am I a polar bear?"

The father polar bear replied, "Of course, son, you're 100% polar bear."

A few minutes pass, and the son polar bear turns to his father again and says, "Dad, tell me the truth. I can take it. Am I really a polar bear? No brown bear or panda bear or grizzly bear?"

The father polar bear replies, "Son, I'm 100% polar bear, your mother is 100% polar bear, so you are definitely 100% polar bear."

A few more minutes pass, and the son polar bear AGAIN turns to his father and says, "Dad, don't think your sparing my feelings if it's not true. I gotta know, am I 100% polar bear?"

The father polar bear was distressed by this continued questioning and asked his son, "Why do you keep asking if you're 100% polar bear?"

"Because I'm freezing!"