In Brazil, thousands of bumblebee catfish were filmed inching up vertical rock faces, fins spread wide and fish climbing over one another. The footage records the climb; the researchers suggest that the group was moving upstream to spawn because mature males and females appeared during the rainy-season migration. The purpose and the exact grip mechanism remain open questions. 1 #WeirdScience #AnimalFacts #ScienceDoodle #FishFacts
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