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Beavers can also help restore burned areas: Their dams trap ash and debris, and their wetlands help rehydrate landscapes, supporting the growth of grasses and shrubs, Lundquist said.

None of the nine people on the run were carrying water which also meant there was no way to cool down or rehydrate him when he collapsed.

"A donkey will be able to go for perhaps 24 hours without drinking and can rehydrate very quickly without any problems."

It takes time to rehydrate and should be rinsed several times due to the possibility of salt contamination.

Veterinarians rehydrate it with saline solution before surgery, then lay it over a dog's corneal lesion and suture it into place, where it acts as scaffolding for regenerating cells.