Cats trade efficiency for stealth

Stealth comes at a cost – at least it does for cats. They sacrifice energy-efficiency for their slinky moves. Humans, dogs and horses are highly energy-efficient walkers, and all walk with relatively straight, stiff legs, says Kristin Bishop, a biologist at the University of California, Davis. She wondered if cats, with their crouched gait, managed a similar efficiency. To find out, Bishop and her colleagues observed domesticated cats walking along “force plates”,
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