With around 326,000,000,000,000,000,000 gallons (326 million trillion gallons) of water on Earth, covering 71% of the Earth’s surface, you’d think it would always be easy to find water we can drink. In fact, only around 3% of the planet’s water is freshwater, the non-salty water that’s so necessary for our survival, and only 1% of that freshwater is accessible for human use.

Learn about The Basics of Freshwater, as well as how animals like the nerpa of Lake Baikal and the Sahara Desert‘s addax antelope, adapt to the amounts of water available where they live in Water, Water, Everywhere? with Sabrina Cruz and Crash Course Kids.

Related listening at The Naked Scientists: Why isn’t rain salty?

Learn about a few more amazing bodies of water — Jellyfish Lake, The Grand Prismatic Spring — and watch more videos about adaptation on this site, including some impressive animal/water relationships: Fish and frogs that live out of water, the Kingfisher hunts for fish on the River Shannon, and Beavers! Ecosystem Engineers.

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