1. Every human in the world v every bird in the world
    There are about 400 billion birds in world. No guns
  2. Bull shark v saltwater crocodile
  3. Polar bear v silverback gorilla
  4. Elephant v 150 ducks
  5. Rhino v 10 wolves
  6. Kangaroo vs chimpanzee
  7. All humans in the world vs all other animals in the world.
    Modern weapons and technology allowed