Classic.
Analysis of fossils from Alaska points to climate change, not introduction of a super predator (humans), as the agent of the disappearance of horses from the region about 12,500 years ago. Known climatic data and archaeological signs of evolutionary stress coupled with the standard interpretation of evidence of the time of human colonization of the area preclude human hunters as the agent.
But wait. On the same day, new evidence from eastern Siberia is forwarded that human hunters were nearby (only somewhat but in previously thought uninhabitably frozen ecosystems) long before earlier digs had shown.
I'm still awed by the thought of 5 foot tall humans with no weapons more dangerous than a spear taking down some of the biggest mammals ever known.
Can you say 'cooperation'?
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