The animal that never drinks water its entire life
This desert animal can live its entire life without ever drinking a single drop of water.
Which one is REALLY true about the Kangaroo Rat?
The short version
The kangaroo rat gets nearly all its moisture from dry seeds, with its body producing water from the food itself; its ultra-efficient kidneys make near-paste urine and it doesn't sweat. It leaps nearly 9 feet on kangaroo-like legs and can kick a striking rattlesnake.
Why it's so weird
- ✓The Kangaroo Rat can live its entire life without ever drinking a single drop of water.
- ✓The Kangaroo Rat makes its own water chemically from the dry seeds it eats.
- ✓The Kangaroo Rat has kidneys so powerful its urine comes out almost as a paste, and it never sweats.
- ✓The Kangaroo Rat leaps nearly nine feet in a single jump on huge kangaroo-like back legs.
- ✓The Kangaroo Rat can kick a striking rattlesnake before it can bite.
You could line up about 9 of them along a 7-year-old!
The full story
This little desert animal can live its whole life without ever drinking a single drop of water. Meet the kangaroo rat, a tiny survivor of the driest deserts in North America. It gets almost all the moisture it needs from the dry seeds it eats, with its body chemically producing water from the food itself. Its kidneys are so powerful that its urine comes out almost as a paste, wasting barely any water at all, and it does not even sweat. To escape predators, it bounces away on huge back legs like a miniature kangaroo, leaping nearly nine feet in a single jump. It can even hear a snake or an owl coming in near silence, and deliver a lightning-fast kick to a striking rattlesnake before it can bite. A rodent built entirely for the desert. Follow for more weird animal facts.
A kangaroo rat doesn't drink because its body builds water out of its food. When its cells "burn" the sugars and fats in dry seeds for energy (a process called respiration), they join hydrogen from the food with oxygen the animal breathes in, and that chemical reaction makes brand-new water inside its body. To keep every drop, its kidneys have extra-long tubes (loops of Henle) that squeeze almost all the water back out of its pee, so the urine comes out thick and pasty, and it barely sweats or breathes moisture away.
📚 Source: Kangaroo Rats — White Sands National Park (U.S. National Park Service) ↗In a classic 1951 study, scientists Bodil and Knut Schmidt-Nielsen fed kangaroo rats only dry seeds and no water, then carefully measured all the water going in versus out, proving the animals stayed alive on the water their own bodies made from the food.
📚 Source: A complete account of the water metabolism in kangaroo rats and an experimental verification (Schmidt-Nielsen, 1951) — PubMed ↗Watch the 45-second version
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“The Kangaroo Rat can live its entire life without ever drinking a single drop of water.”
“The Kangaroo Rat lays an egg weighing up to a quarter of her own body weight, the biggest egg for body size of any bird.”
“The Kangaroo Rat makes its own water chemically from the dry seeds it eats.”