They are particularly skilled at photobombing. Photobombing is defined as showing up in pictures you aren't supposed to be in. Think... drunk guy in background at formal wedding picture. There are some examples here, here, here, and here. The irony here is that when I am actually trying to take a picture of the girls, they zip off to the other side of the yard. I can't get them in the frame.
Sasha, being eaten(?) by lilac bouquet