Rose bedeguar gall
This pretty, feathery thing is actually a gall – a growth of specialised plant tissue formed by a parasite. The parasite, in this case a wasp, injects a chemical into the host plant which causes an abnormal structure to develop which is then controlled by the insect. The larva then lives inside this strange microhabitat, protected and nourished. Bizarre. I’ve seen galls on trees before, and malformed acorns due to the gall-forming Knopper wasp, but I’ve never seen such a pretty one as this before.