Present participle of 'brachiate'; currently moving by swinging with the arms.
From 'brachiate' (to move by swinging arms) + present participle suffix '-ing.' Creates the continuous form of the 19th-century scientific verb describing primate locomotion.
If you watch video of brachiating sloths, you'll notice they move in slow motion compared to gibbons—but both are perfectly adapted for their specific rainforest niches.
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