One of the Ponies on Scott's Terra Nova Expedition
Scott's expedition to the Antarctic relied heavily on ponies, but the ponies weren't suitable for such a cold climate and could not pull the sledges of equipment like a team of dogs would have been able to. This meant that the explorers ended up having to pull the sledges themselves, an incredibly exhausting task that may have contributed to the failure of the expedition to return safely after reaching the South Pole
Image: © Herbert Ponting | Wikimedia Commons