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Physiology

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green blooded lizard

BLEEDS GREEN The few lizards with green blood, such as this green skink from Papua New Guinea, may have acquired the coloring via a spotty pattern of evolutionary history. Their muscles, bones, tongues and gums also look greenish.

Bajau diver spear fishing

DAY JOB A Bajau diver, spear in hand, fishes off the coast of Indonesia. Bajau divers spend 60 percent of their diving time completely underwater, comparable to sea otters.

polar bear

BEARS ON ICE  A study that put camera collars on polar bears showed that the bears have higher springtime metabolic rates than previous estimates.

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