"I am a bird that chose the sea over the sky. I wear a tuxedo every day. I live where it is coldest yet I huddle together for warmth. What am I?"

Answer: A Penguin. Penguins are birds whose wings evolved into flippers — they cannot fly but are extraordinary swimmers. Their black and white colouring resembles formal wear. Emperor penguins in Antarctica huddle in groups of thousands to share body warmth in extreme cold.