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Lizards and other cold-blooded critters bask in the sun to keep warm. But they also do it for the vitamin D, a new study finds.

"It's a longstanding assumption that thermoregulation is the only reason that lizards bask," said study leader Kristopher Karsten, a biologist at Texas Christian University. "Our results suggest that in addition to thermoregulation, vitamin D regulation appears to have a significant impact on basking behavior as well."

Lizard | Reptile | Rock | Relax | Skin | Eye