It seems reasonable to expect that some behaviors transcend culture and go back to instinct (tho expectations often conflict with reality) which probably is not even human specific.
IIRC Konrad Lorenz pointed out in Solomon's Ring that rooks will exhibit "infantile behavior" when grooming in a mated couple which, well, humans do it when they cuddle too.
As an aside: my favorite italian gesture is "tasty" (put index on cheek and spin back and forth) which is only used by and for children. I'm on a lifelong mission to spread it everywhere.
The Dutch version of this is to wave at the cheek.
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> that some behaviors transcend culture and go back to instinct
My first thought was "is it only Italians and Dutch, or are the two the only groups they could cover with their given funding?".
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The trick to training rocks is telling them to perform behaviors they're going to do anyway.
https://www.youtube.com/watch?v=SG0FAKkaisg
Oh, rooks! I though you said rocks. Never mind!
I don't think these are special as in rare, but they are cool. Many countries have gestures for the same thing. In portugal you pick up the ear lobe with your index finger and thumb, stretch the other fingers and pull it a few times. It means tasty also. You may accompany it with saying "it's from here", as in the food "is from the earlobe" which means its good, but mostly its done silently.