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Studying galls is very good fun - but be a little careful because not all that comes out is a cynipid ... and even if it is a cynipid it might NOT be the builder of the gall. There are species of cynipid that live as 'inquilines' (or 'squatters') inside the gall of another cynipid. Also, in my experience you are *much* more likely to see chalcid parasitoids appearing from a gall ... the original causers of the gall are often quite scarce. :)