Three kinds of snowbirds

What's a snowbird? A well-heeled retiree who flees the snow to winter in the sunny south? A stunt pilot of the crack Air Force team? A bird, a winter bunting like in the Anne Murray song? I thought "snowbird" when I saw the naturally formed sculpture below. See the bird's profile bottom left? Black eye, black beak.
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Dr Ghosh, the Three L's and Cutting for Stone

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Outside the Langley air museum, planes routinely take off and land