泛滥之谜 11

Fish can now colonise areas that were recently grassland.

For just a few weeks they can take advantage of the huge new supplies of food.

Spot-necked otters are very social.

They live in close-knit family groups, often hunting together.

Intelligent and agile, they hunt using speed and cunning.

Webbed feet give propulsion and a long tail helps them steer.

Although they prefer fish

these otters will sometimes eat snails,frogs or even insects.

But there's one swamp creature that really will eat anything.

With a muscular body one and a half metres long and a powerful, poisonous bite

the Nile monitor is understandably avoided by all its neighbours.

Relatively clumsy on land, underwater it's transformed into an agile hunter.

But the huge lizard is just as happy

eating others' rotting leftovers on the bottom of the swamp.

In fact, it will eat and digest almost anything it can fit into its mouth.

The Nile monitor is one of the most adaptable of all the Sudd's animals.

In this constantly changing water world, it's a winning strategy.

Soon it's all change again.