A gall is an abnormal growth of plant tissue usually caused by the action of an insect, usually a gall wasp. Each clump of tissue will harbour the larva (0r larvae) of the wasp. However, a whole association of other creatures can live in the gall. Some of them are inquilines that only join the gall after it has been formed – they live in and on the gall tissue not actually harming the original insect but fighting it for food and shelter. Both the gall causer and the inquiline are subject to attack by insect parasites but these very parasites are likely to be attacked by hyper-parasites – the biter bit so to speak.
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