This is an oak apple, home to several gall wasp grubs. It is soft and spongy and rather larger than the hard marble galls found on young oak saplings. These were found on oak trees up at the viewpoint at Filnore Woods. The grubs will emerge as adult mini-wasps in June and July and the oak apple will drop off and decay, unlike marble galls which persist on the tree.
Here are some marble galls, photographed in February.
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