Yak's on the Snow

I present you the Yaks! They are mobs that live in snow biomes, primarily in the Ice Spike Biome. They live at high altitudes, are resistant to frost damage, don't slip on ice, and don't sink in soft snow. In addition, they provide wool and milk. Yak milk is said to be much more nutritious than regular milk. Your manure can be used as fuel for furnaces and fertilizer for composters! They possess a considerable number of hearts and are VERY strong. I thought of that because ice is basically inhospitable and without resources. It would be a perfect fit! And I'm not kidding, I've traveled A LOT in an old world and there were several interconnected snow biomes, this would help a lot.