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Nice shot.
Judging by the spots on their coats I would say these are likely some immature siblings. Based on what I've seen over they years it's probably more likely for young siblings to travel like this. Adults, not so much.
 
I'd say that since there's a 50/50 chance of the synchronicity happening, it's going to happen often. The chances of seeing it every time it happens are very low. Nice capture of it, too, it's very cool looking!