A tardigrade refers to any of the members of the phylum Tardigrada. Because tardigrades are water-dwellers and have barrel-shaped bodies they are also called bear animalcules, sloth animalcules, and water bears. They are microscopic. Adults are usually 0.02 inches in length. They have plump, segmented bodies with four pairs of legs. Each leg has claws or sucking disks. They are herbivorous invertebrates that feed mostly on plant cells and algae. They are known to be one of the most resilient animal life forms as they could survive extreme temperatures and pressures.
- Sloan, David; Alves Batista, Rafael; Loeb, Abraham (2017). "The Resilience of Life to Astrophysical Events". Scientific Reports. 7 (1): 5419.
- Miller, William (2017-02-06). "Tardigrades". American Scientist.
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