My wife Kathy has 4 big "butterfly bushes" along our back fence and the Monarch Butterflies are loving them this summer. They are out there all day, every day, and don't seem to be to scared of me as I'm out there every day.
I took a few pics of one of them this morning with my cell phone. You can see in the "before" that he's down in the flower looking for "lunch". In the "after" picture you can see that he's all loaded up with lunch. The cropped picture is just the "after" picture that has been cropped to show his success a little better.
Some times there are 8 or more of them out there enjoying "their bushes".