Tiny - about the size of an aphid, pictured here on a blade of iris.
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An aphid that was parasitised by a tiny wasp whose larva fed within the aphid before pupating and emerging through the whole you can see in the photo.
Once you start looking for them it is quite easy to spot these plump, straw-coloured individuals among non-parasitised ones.
Thank you. That is so interesting. I wondered what the hole was.
Lat/Lng: 54.4, -6.5
OS grid ref: NW1212