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Rare Bumblebee Catfish Surprises Scientists With Unique 'Climbing' Skills

A group of bumblebee catfish performed a gravity-defying display, swimming up a mini waterfall in the Aquidauana River in the central-western state of Mato Grosso do Sul, Brazil, footage captured at the end of last year shows.

The behavior was discovered when the Environmental Military Police spotted thousands of bumblebee catfish scaling up slippery rocks on November 16, 2024.

Within a week of its discovery, a team of Brazilian scientists arrived at the scene to study the rare phenomena, and subsequently published a scientific article along with the videos.

The footage shows groups of bumblebee catfish, otherwise known as Rhyacoglanis paranensis, “clustered and slowly moving upstream,” the study said.

Some of the videos also captured large numbers of the species piled onto walls, which the study described as an aggregation “so massive that specimens were seen above each other, climbing the large cluster of fish.”

Researchers concluded the bumblebee catfish were likely migrating upriver to spawn, noting that this was the first time such a migratory pattern was documented.

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