Duck, Duck, GOOSE/GREY DUCK

I lived the first part of my childhood in Albuquerque, NM where we said “Duck, Duck, Goose.” The second half in Minnesota, where they said “Duck, duck, grey duck.”

I get that it’s regional, but why the difference? And what the heck is a grey duck.

In the original game, you walk around a circle of people, patting their head, saying “duck, duck, duck…” then “goose” and try to run around the circle and get in the goose’s seat without being tagged by said goose.

In Minnesota, you say “red duck, orange duck, chartreuse duck, purple duck, GREY DUCK!” and do the same thing.

How did this split happen? I also understand that there are variations on the game, but why complete disregard for “Duck Duck Goose” in Minnesota and why nowhere else (besides South Dakota according to Wiki)?

Just checked out the Wiki article, looks like I was missing out on a lot of fun! http://en.wikipedia.org/wiki/Duck_Duck_Goose#Duck_Duck_Splash