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Found this in a pond, it is about 1mm long. photos taken down a microscope. In the video you can see something moving inside it's body.
It was in a drop of pond water on a microscope slide, I put a coverslide on it to stop it moving (after I removed it, it swam away)
It looks exactly like a copepod, Cyclops viridis, judging from google images of that species. (& in the observer's book of pond life, the extent of my knowledgeof copepods)