Gone for all time. The arctic ground squirrel regularly survives a body temperature of 27 degrees. A new species discovered in 1967 in Japan. Beavers have 2 sets of lips. Their teeth grow 3 feet a year.
Arctic tern has longest.
All the way around the world. The only marsupial in North America. Can give birth to 20 babies at a time. All snakes are deaf. Giraffes and humans have the same number.