Better photo of the thing inside.
Not a clue what it is! I've used my go to biological AI image recognition tool on iNaturalist and that doesn't offer up anything even slightly relevant. Where are these things - is it in a coastal setting, on land etc?
In my back garden which is suburban Glasgow!
Wondered if they could be something to do with greenfly as they were on a paving slab underneath a sycamore tree that’s badly infested.
They really pop and jump!
@JoePablo started
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Better photo of the thing inside.