Hippos in dark water Jan 29 2008
Darkness is falling and a pod of hippos in the Blyde River, in South Africa, is just visible as their nostrils and the ridges over their eyes protrude above the water.
The dominant bull holds sway over the group of females and younger animals, but his authority is beginning to be challenged by a younger male. There could be a clash in future.
Watch these prehistoric-looking creatures in the Earth-Touch clip Calm before the battle.




















