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Project Noah Nature School
Technically an insect - parasitic wasp lays egg on oak and tree has an immune reaction to it, creating the gall.
Spotted on May 18, 2012
Submitted on May 21, 2012
2 Comments
These were most likely produced by a type of Gall Wasp. This would be a great addition to the Arthropod Galls mission: http://www.projectnoah.org/missions/1473...
Whoa! Great pictures. I've only ever seen them once they're dried up.