We found this oak twig, sporting a cluster of interesting growths, behind the Northern Woodlands office in Lyme, New Hampshire, last week. Those are definitely not acorns. What are they?
Answer
These are banded bullet galls, created after a wasp laid its eggs on an oak twig. The wasp injects chemicals into the plant tissue, causing a gall to form around each egg. These galls protect the larvae, once they hatch, and provide a source of nutrients.
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