Why all Boston Dynamics robots are walking on bent legs?

See, for example, this video. And it is not just Boston Dynamics, but pretty much all humanoid robots have this nonhuman-like walk. Walking with bent knees would be horribly inefficient for a human. Shouldn’t the same be true for robots? What is advantage of bent knees and why robots cannot walk on straight legs?

submitted by /u/goodpoll
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