1) The national animal of Australia is the kangaroo.

2) The world's oldest known living tree is a bristlecone pine named "Methuselah" in California, estimated to be over 4,800 years old.

3) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).

4) The Hollywood Walk of Fame features more than 2,690 stars embedded in the sidewalk, honoring notable figures in the entertainment industry.