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Spectacle caiman linger below,
waiting for a meal to fall out of the sky.
When rivers finally reach the sea
they slow down,
release their sediment
and build deltas.
In Bangladesh
the Ganges and Brahmaputra rivers join
to form the world's biggest.
Every year almost 2,000 million tonnes of sediment
eroded from the Himalayas is delivered to the ocean.
At the delta's mouth
the largest mangrove forest in the world -
the Sundarbans.
These extraordinary forests
spring up throughout the tropics in these tidal zones
where rivers meet the sea.
Crab-eating macaques are mangrove specials.
In Indonesia
these monkeys have adopted a unique amphibious lifestyle.
They fish out fallen food.
The troop also uses the waters to cool off during the heat of the day.
But the channels are also the playground for restless young macaques.
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