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The Mara river, snaking across the plains of East Africa.
As the land flattens out
rivers slow down
and lose their destructive power.
Now they're carrying heavy loads of sediment
that stains their waters brown.
Lines of wildebeest are on the march.
Each year nearly 2 million animals
migrate across the Serengeti plains
in search of fresh green pastures.
For these thirsty herds
the rivers are not only a vital source of drinking water,
but also dangerous obstacles.
This is one of the largest concentrations of Nile crocodiles in Africa,
giants that grow over five metres long.
From memory, the crocodiles know
the wildebeest are coming
and gather in anticipation.