1. Killer Whale Gang Develops New Language to Terrorize Ships  The Daily Beast
  2. Rock art from at least 67,800 years ago in Sulawesi  Nature
  3. Faded hand shape in Indonesian cave may be world’s oldest rock art  CNN
  4. Oldest cave painting of red claw hand could rewrite human creativity timeline  BBC
  5. The world’s oldest rock art discovered in Indonesia  National Geographic