| Scientists 'rebuild' Grand Canyon Scientists have begun releasing floods of water into the Grand Canyon in an attempt to boost local wildlife.
In an operation lasting 90 hours, huge jets of water are pouring from a dam, taking with them hundreds of thousands of metric tons of sand and silt.
It is hoped the sediment will recreate the sandbars, backwaters and beaches needed by fish, birds, snails and plants that are currently dying out.
Four of eight fish native to the Grand Canyon have already become extinct.
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