The hippo will no doubt remain a force to be reckoned with in the wilds of Africa. But paleontologists may have at last wrestled with the river horse and won.

• 在非洲的野地里，河马仍会是一股难以对付的力量。但在演化学上，或许考古学家终于赢得了这场与河马之间的战争，找出其演化起源。