Sunbathing: good for your bones (if you’re a lizard)

Cold-blooded animals don’t produce their own heat, and thus they must sunbathe, basking in the sun’s rays to raise their body temperatures so they have eonugh energy to  go about their business. But for some ectotherms, the sun isn’t just a source of heat.  A new study shows that in the panther chameleon, native to Madagascar, basking behavior also controls production of essential vitamin D. In reptiles, vitamin D3...

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