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This acorn gall is built by a parasitic Eriococcidae bug. But wait, a hole in the top. This is the exit point of one of several parasitoid wasp that has already eaten the bug and departed to find some more.
What you find in the gall may not be what made the gall. Here is a fatter, healthy gall with its original tenant. http://www.projectnoah.org/spottings/819...