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Hippoboscidae, at Pe?iscola, Castellon, Spain, in summer 2006, in a cage with eagle owls (Bubo bubo). Maybe Ornithomyia sp?

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Yes. Not enough detail to go to species level.

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Thanks Paul!

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Eagle owl must be Ornithomyia avicularia.
The other species occur in birds of size of Great Tit or smaller.
And the last time I checked, Eagle Owl was bigger.
By the way, the funny green colouration indicates that the fly has blood in it.

Theo Zeegers

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Thanks Theo! The species are identified!
And I don't knew that the cause of green coloration. Thanks also for this information!