There are plenty of species that we know exist, but the finer points of their day-to-day lives, breeding behavior, and ecology have not been extensively studied. In the Paraguay River basin in Brazil, a species of catfish has been observed shimming their way up the side of waterfalls in great numbers, a behavior that has never been seen before. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Bumblebee catfish ( Rhyacoglanis paranensis ) are a small species, only measuring less than 9 centimeters (3.5 inches) long. They are beautifully patterned with striped dark blotches on a lighter background.

Typically, this species and the other eight in the genus Rhyacoglanis are found in fast-flowing rivers, which makes studying them quite

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