Oak galls  are produced by the tree in reaction to wasp larvae.
Oak galls are produced by the tree in reaction to wasp larvae. Bigstock
Oak galls are produced by the tree in reaction to wasp larvae. Bigstock

Gall wasps keep mystery ‘balls’ hopping

November 07, 2014 04:00 PM

UPDATED November 08, 2014 12:00 AM

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