Thanks for all of the nice comments everyone! I didn't expect this one to come back 4 months after I originally posted it, even though it's one of my favorite shots from last spring.
I set-up under a blind near the den before sunrise, then waited until the kits came out. One by one, these four came out - each lining up beside the other. Patience... and luck. The fun was watching them play for the next 2 hours!!!