The microscopic water bear that can survive a century of drought
In short: Imagine an animal so resilient it can be boiled, frozen, or blasted into the vacuum of space and still walk away. Meet the tardigrade: a microscopic predator that enters a state of suspended animation to cheat death, surviving for decades without a single drop of water.
Tardigrades, often called "water bears" due to their bear-like claws and dagger-like teeth, are nearly indestructible invertebrates. Measuring only about 0.5 millimeters in length—smaller than a poppy seed—these eight-legged creatures can be found in extreme environments across the globe, from the Himalayan mountain range to the icy depths of Antarctica and even into bubbling hot springs.
Their primary survival mechanism is a process called cryptobiosis. When faced with extreme dehydration, the tardigrade curls into a dry ball known as a "tun." In this state, their bodily systems slow down so significantly that they are almost entirely inactive. This allows them to survive for decades in a dormant state; notably, specimens found in museum moss that had been dry for 100 years were able to resume activity within hours of being moistened.
The limits of tardigrade resilience are staggering. They can endure temperatures ranging from -328°F to 304°F and have survived radiation blasts 700 times stronger than what is found on Earth's surface. In 2007, scientists even sent them into space via satellite, where they survived the vacuum of the atmosphere and freezing temperatures for 10 days at an altitude of 167 miles.
While they are masters of survival, they are not invincible. These omnivores typically feed on moss, algae, and bacteria, but they face their own predators in the wild, including amoebas, nematodes, and other tardigrades. By studying these organisms, scientists hope to unlock new secrets about biological resilience and what might be necessary for human life on other planets.
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Sources
- Summary by Intellect · source: The Tiny Predator That Can Live Without Water
- Also: Tardigrade
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