>Blue bees

We actually have something like 100 different bee species in America. Very few are social like honey bees. In fact I think i spotted one I've never seen before in my yard, visiting some flowers. It was really big, like maybe four times the size of a honey bee. It's wings were beating really fast as it hovered. I thought it was a carpenter bee but then I noticed it was all yellow.

ed: Just looked it up. It was a carpenter bee, but a male. Stingless, like all males bees. Commonly known as The Teddybear Bee.

The ones that are superior pollinators for avocado are Green Orchard Bees. They are about fives times better, and hardy ever sting anybody. Tricky to establish a colony, though, and they may well just leave at the end of the summer.