Check out this cool green bee I found in the yard

Found this little guy hanging onto his last bit of life in the yard the other day.

Any idea on what type of bee or insect this is?

Cool nest I found today!

Found a cool nest today under a  boulder in the back yard. I thought I saw something fly by me and right into the rocks...sure enough it looked like some type bee or hover fly?

Anyone know please tell me. Pretty cool to have all this life  around us! The garden should be a lot of fun.