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@mvnla2 – I watched the occurrence of snoutling upgrades decline as my birds reached rank ten as well. I did not do any statistical readings to verify, but my logical explanation for the phenomena was that the odds of getting an LC upgrade increased as the number of available snoutling upgrades declined. For example a player with all 25 bird classes below mastery rank 10 has 29 possible replacements each time they redeem an upgrade option (25 class upgrades+5 bird upgrades+1 all bird upgrade-the two upgrades already occupying places on the screen) As individual headgear reaches rank ten, it reduces the first group from 25. The numbers continue to work against the player as more classes reach max rank, however once all five classes of a bird reach rank ten, the LC upgrade is also removed from the board for that bird bringing things back in line. On the plus side, if you can bring four of the birds to a full rank 10, you can keep spinning the dojo all day until all of the classes of the fifth bird reach rank ten as well, as you are guaranteed to get a snoutling option at that point with only two LC upgrades left (All birds and single bird) the third has to be a snout upgrade.