Tortoises in the Mojave Desert store up to 1/3 of their body weight in urine. When they need water, the water in their urine flows back into their bodies while the waste remains and expels.

Lack of sleep can affect your immune system and reduce your ability to fight infections.

The mating call of a male toadfish, who are underwater, is so loud that it can be heard by humans above water.

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