File this under 'nature is wild'—researchers in Brazil just caught thousands of tiny bumblebee catfish scaling a 4-meter waterfall like little aquatic ninjas. These fish are less than 4cm long but managed to climb rocks, even stacking on top of each other to get upstream (probably to breed). They even tried to escape the researchers’ bucket! Scientists think they use their fins as anchors and maybe even have a suction trick. Who knew fish could be this extra? #Science #NatureIsWild #Catfish