From Live Science:
The stealth and balance that cats are known for when they move comes at the expense of energy efficiency, a new study finds, showing that evolution isn't always about efficiency.
"It is usually assumed that efficiency is what matters in evolution," said evolutionary anthropologist Daniel Schmitt of Duke University. "We've found that's too simple a way of looking at evolution, because there are some animals that need to operate at high energy cost and low efficiency."
Namely, cats.
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