Under the cover of darkness, thousands of tiny bumblebee catfish were caught orange finned by police, wriggling their way a waterfall in Brazil.

The boulders of the Aquidauana River waterfall are up to 4 meters high, yet somehow these catfish ( Rhyacoglanis paranensis ), which are less than 4 centimeters (1.6 inches) long, manage to scale them like mini Olympic rock climbers.

Researchers from the Federal University of Mato Grosso do Sul observed the black-striped orange fish for 20 hours after the police alerted them to this mass migration event, occurring right near their department, in 2024.

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"On more flattened and horizontal rocks, aggregation was so massive that specimens were seen above each other, climbing

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