From wikipedia: > Although sweating is found in a wide variety of mammals, relatively few, such as humans and horses, produce large amounts of sweat in order t

From wikipedia: > Although sweating is found in a wide variety of mammals, relatively few, such as humans and horses, produce large amounts of sweat in order to cool down. We don't beat them out necessarily because we can replenish more, but because we are much more efficient at cooling ourselves. Obviously water and tools helped us, but imagine trying to compete in a 5k wearing a rubber suit--you wouldn't come close to competing with those humans you're up against.