I've heard about stingless bees, but have no further idea. Will check your post, thanks! I haven't heard anyone having this kind of bees around, they are definitely not native here. We used to have the usual bees that when they get angry they furiously sting :) On the contrary with yours, where we lived in Crete the native species was very aggressive and was really hard to handle. Ours looked like angels compared to them :)
Best of luck with your new projects!!!