On my first ever journey to the snow biome I saw a lvl 135 female and tamed it. Over the next week or so I would tame 5 more yutys, with wild lvls 115, 115, 125, 130, and 140. The lvl 140 tamed out at 9680 hp with 448% melee. These stats are a lot better than even my Rex. I started breeding the 6 yutys to combine the best stats together, but every time I get close to that it mutates and I had to repeat the process with the mutated stats. Finally, after more than 3 weeks of breeding and hatching probably >100 baby yutys, I have the perfect yuty. It has 10560 hp, 1932 stam, and 462% melee (2 hp mutations and 1 melee mutation from the original lvl 140). I just counted 29 yutys used in breeding in my base, and I’ve already killed a couple obsolete ones to feed and tame charcharos. Finally, my base can be free of dozens of giant chickens everywhere.