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Hello Jan,

Encyrtidae is an excellent suggestion! I didn't think about a chalcid wasp. Very interesting. I've seen Encyrtidae come out of true bug eggs before but i seem to have forgotten what they look like. I don't know why it was roaming around the bird nest but i'll keep investigating this event. I should've inspected the nest quickly but tolerant birds can become distressed very quickly, so time is of the essence. I got quite familiar with this pair of L. collurio. For some reason, they only had one egg (the one in the photo.) The immature (from this egg) let me get close enough to make nice photos of it sleeping a few weeks later (but it kept one eye open) :)

I've studied birds since i was a child. Birds are my favorite animals.

Best wishes,
John