H. eglanterina mass twitch defensive behavior

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Uploaded by on Sep 14, 2006

A group of Western Sheepmoth larvae twitch in unison as a defensive move to ward-off predators. Much more butterfly/moth video, photography and life cycle studies available free to the public at HTTP://jcmdi.com, and the Hi-Res version of this video is available on DVD at http://technician.jcmdi.com/lepdvd01/lepdvd01.html for details.

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Uploader Comments (jcmegabyte)

  • How can people say that insects aren't beautiful?

  • ...and they're such good dancers, too! XD

  • It's very interesting!They react to the vibrations of music!

  • I've only seen them do that a few times over the years. This was the only time music was playing. I don't know if they were actually moving to the music or not, but it sure looked like it! :D

  • Do you know if any other species have this behavior? Or do they maybe migrate out east too?

    I ask because I happened to see an entire tree covered in caterpillars doing the exact some thing a number of years ago, but I don't live out west. The ones I saw were in Indiana.

  • As far as I know, most (if not all) Hemileuca species group together as shown in this video. They also move in a single-file procession (see my other vids: k1vSffb1Kog and eM_QJpllw00 ) until they're mostly grown 4th/5th instars. The mass twitch behavior I'd never seen before but it's likely a universal Hemileuca trait too. Buckmoths/Sheepmoths are found all over the US, H. maia is common in the east and are likely what you saw, if Hemileuca. :D

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  • I've heard that too - in fact, I saw microvolt-level analysis of plant reactions to various music that actually lends some scientific weight to that theory. Interestingly, I've seen this mass twitch defensive behavior with other mass-feeding larvae before, but never timed to the music like this! I haven't tried it with other music, yet! :-)

  • Cool. Thanks.

    I've been wondering what it was that I saw for ages.

  • Bust a move!

  • cool!

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