Here are several of the images I've taken this year
I noticed the dark background, did you take them at night?
The reason the background is black is because in order to freeze the wings I have to use a flash, then deliberately underexpose the photograph so that the only light available for the photo is the flash. This makes the background black.
What camera did you use for these photos? They are great!
Camera used was a nikon D2x with a 200mm lens and a Nikon SB-800 flash.