Oak Apples

There’s an apple on an oak tree over there. It’s not a fruit though, it’s a gall caused by the Oak Apple Gall Wasp Biorhiza pallida.

Oak Apple - The Hall of Einar - photograph (c) David Bailey (not the)

The wasp has irritated the tree into building this beautiful home for its family. It saves them having to build a nest for themselves. Brilliant.

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