For the perso who says take it in the ice biome, NO. I tried that. I did not work for me. Also, keep in mind, the ice biome requires 2 fires to reach cold. Even with a full hide armor set its still freezing. Plus most mammals there have thick fur, or a lot of fur. And its mode says HARD. Even on casual and easy mode. Yet bringing an otter when its half morning half afternoon, or half afternoon half night, when the sun sets, for that short minute you will be on cold if you have a full hide armor set.With otter, MAYBE you could get to normal. From all I know. Im only lvl 30. So dont excpect me to be accurate.