Polar bear was put on display in Boston, Massachusetts, in 1733. Idea: Children could discuss why this would be a very big event for that time period. Carnivores, polar bears are becoming rare. Today scientists estimate 20,000 to 25,000 polar bear exist. Experts believe that by 2050 that number will be cut in half. Children can learn more about polar bears and see some great photos at: Polar Bear. Interesting coincidence – Raymond Briggs, born on January 18th, wrote a book in 1994 about a polar bear called The Bear. It was made into a short animated video.