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A week ago I took a picture of this fast-moving and impressive, albeit common, White-Marked Tussock Moth Caterpillar (Orgyia leucostigma). Pls correct the ID if wrong: http://www.flickr.com/photos/92981528@N08/9501075283/ Then it reared its head up at me and waved its front tufts in the air. Closeup of front end here: http://www.flickr.com/photos/92981528@N08/9503879386/ Details are in photo captions. I thought caterpillar tufts and hairs were passive structures, moving only as the body moves. But they must have muscle control to wave independently of one another like that. Are they a modified antennae or leg or? Can't find anything out searching the internet or in the books I have so I will try here. Nancy
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