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The crocodile's jaws snap tight like a steel trap -
once they have a hold,
they never let go.
It took over an hour
to drown this full-grown bull.
To surprise their prey
crocodiles must strike with lightning speed.
Here,
only the narrowest line separates life from death.
Most rivers drain into the sea,
but some end their journey in vast lakes.
Worldwide lakes hold 20 times more fresh water than all the rivers.
The East African Rift Valley
holds three of the world's largest:
Malawi,
Tanganyika,
and Victoria.
Lake Malawi, the smallest of the three,
is still bigger than Wales.
Its tropical waters teem with more fish species than any other lake.
There are 850 different cichlids alone,
all of which evolved from just one single ancestor isolated here thousands of years ago.
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