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Can anyone please help identify this insect. It seems to be some sort of caterpillar but I'm stumped.

  • Location is in Suffolk, United Kingdom
  • Length is around 1cm, width is perhaps 4 or 5mm.

Insect

Image opens a video clip on YouTube.

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  • $\begingroup$ Is there a way to embed the video into the question? $\endgroup$ – Alex Holsgrove Aug 30 at 11:00
  • $\begingroup$ There are a number of larvae that glue detritus to their backs. I'm not sure what this one is. $\endgroup$ – Karl Kjer Aug 30 at 17:25
  • $\begingroup$ Welcome to Biology.SE! For identification questions please edit your post to: 1) include the location (e.g. country and region — the more specific the better), and 2) an estimate of the size of the creature. The location and size can be essential clues for identification. ——— If possible a clear, closeup photo would also be helpful. ——— Please also take the time to take the tour and then the help pages starting with How to Ask questions effectively on this site. Thanks! 😊 $\endgroup$ – tyersome Aug 30 at 20:16
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That appears to a "bag worm", which is as you surmised a caterpillar.

This suggest that it is from the family Psychidae, but I won't even try to guess at the species. However, if you see any adults you may be able to identify them using this website.

An example image of an North American species:

bagworm image ©2004 Tony DiTerlizzi from: https://bugguide.net/node/view/8832

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  • $\begingroup$ Thank you. After viewing some videos of this bag worm / case worm moth, it seems to appear, and also move in the same manner. Case closed! $\endgroup$ – Alex Holsgrove Sep 1 at 15:32

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