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Compared to other terrestrial animals, penguins have an excessive amount of side-to-side, waddling motion. If humans waddle too much they fall, but penguins somehow overcome this. They may have an elegant movement strategy for stability that we're unaware of.

Max Kurz
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We found that waddling didn't actually require increased work. Instead, walking is costly for penguins because they have such short limbs, which requires their legs to generate muscular force very rapidly.

Tim Griffin
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