Blows my mind out of my little head to see all these details and sharpness! The stack looks just perfect to me! No halos and perfect light as well. I cannot say / confirm if or that it's a bee, but it looks at least like one.
Possibly a carpenter bee. I like the compositions but you're light is not very well diffused and you're losing a lot of detail due to blown specular highlights. Very tricky to light something that is dark and reflective.