I struck a few U. ferox from my own collected seed and one is definitely not like the others. This has no stingers whatsoever and is "dwarfy" and multi-stemmed compared to its upright foot tall "normal" sisters who are thriving outside. Of course these things happen but no stingers whatsoever on a ferox is kinda weird. Has anybody seen this mutation before? Could it be a hybridisation? I'll certainly try it out on a Red Admiral caterpillar or 2 to see if they if they manage to go full term on it.