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I found this little jumpy cocoon thingie clinking approximately once every 4-5 seconds inside a metal lid. It's been jumping inside there for about a day since I first found it like that. It has a tiny flat mark on one of its sides which suggests that's how it initially stuck itself to something, and then got unstuck. What is this thing?

Here's a short web vid of it: https://giant.gfycat.com/IcyHarmfulCentipede.webm

And here's a static pic:

enter image description here


Update:

It stopped jumping around after about 1.5 days since I found it, and we decided to carefully cut it open with a paper knife. Inside was a white grub with a tiny orange dot on one of its ends, all foldy like a bendy part of a cocktail straw. It was still at first, but we sprayed it with water and put it on a leaf. It started moving around slowly, and looked like it was soaking up water. When we checked up on it later, it had disappeared and probably crawled away somewhere. Unfortunately, I didn't take any pictures of that, so it could have been anything.

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  • $\begingroup$ excellent video! I look forward to learning the answer. $\endgroup$ – Willk Aug 23 '17 at 2:44
  • $\begingroup$ @Will I posted an update. $\endgroup$ – user1306322 Aug 24 '17 at 19:40
  • $\begingroup$ Where in the world are you? $\endgroup$ – Willk Aug 25 '17 at 21:22
  • $\begingroup$ This was found in Russia, near Moscow. $\endgroup$ – user1306322 Aug 26 '17 at 0:37

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