If you're on the killing spree part of the tame, stay away from deep water at ALL costs!!! I just lost a perfect 150 Carcha in the snow biome (The Island) at around 70% taming because a yuty's attack knocked the carcha off a cliff and into the ocean (messed up physics, I know) and no matter how hard I tried to salvage it it still ended up drowning. Additionally, for all on ARK UME single-player, one yuty baby is enough for 100% trust (which is what I used). However, I noticed that sometimes the carcha will eat the corpse and not gain any trust, but going out of render distance before feeding it the second yuty seemed to work. Good luck everyone!!!