The Siberian rhinoceros, or Elasmotherium sibiricum, lived alongside humans, Neanderthals, and other Ice Age species until around 39,000 years ago. Native to Eastern Europe and western Asia, this massive creature, often called the "Siberian unicorn," was known for its enormous horn and thick fur, adapted to harsh climates. Its survival into the era of early modern humans offers fascinating insights into prehistoric ecosystems and interactions between species.