Fascinating things. This has, in my part of the world, been a particularly good year for the nest-like ones such as the robin's pin-cushion seen on roses and caused by
Diplolepsis rosae Galls Page 1
This one was as big as my head but seemed to be on a willow:
But there's some rose hips in there. I couldn't look more closely because it was overhanging the canal!
