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Jan 12, 2026, 6:26 pm72 pts
Mongabay
An inhabitant of the Amazon Basin and one of the world’s largest freshwater fishes, the pirarucu (Arapaima gigas) has a hard skin that’s resistant to attacks from aquatic predators such as piranhas, yet is also flexible. Such features, combined with the diamond-shaped design of its scales, have attracted…
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