TIL about giraffes 

"The irregular brown markings that cover most of [a giraffe's] body ... offer some camouflage, but the markings are primarily used as thermal windows to regulate temperature. Each marking has a large blood vessel around its border. By directing blood flow to or away from the smaller vessels branching toward the center of the marking, the giraffe can radiate or retain heat as needed."

In the Nov. - Dec. 2021 issue of American Scientist. And here:

TIL about giraffes 

@cstanhope what!! amazing.

TIL about giraffes 

@redoak Yeah, I know! I had no idea.

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