More than just a diet: If you are as enthralled by the magic that is BBC Planet Earth 2, then you would remember the marine iguanas (dubbed by Charles Darwin as the “imps of darkness”). These creatures, native only to the Galapagos, have developed a unique trait to adapt to when El Nino washes away their food supply and leads to the death of more than 90% of population. They get smaller and we don’t mean by losing weight. Their physical — form including their bones — actually shrinks to be able to cope with less food. Now that’s a diet (watch, runtime: 1:22).

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