Cynipid Wasps

Bullet Galls and Their Guards

Oak bullet galls have reached their maximum size for the season and will soon release their developing female wasps. The galls arise from twigs and are produced under the direction of several species of cynipid wasps (family Cynipidae). So, you may find different types of bullet galls depending on the exact gall-making wasp species that directed their creation.
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Joe Boggs