Mr.Sheep? Wat are you doing?

Okay, so I was playing a factions server the other day, when i saw the weirdest thing ever. A .......

Sheep! And it wasn't the sheep that surprised me. It was the face. Now I don't have any resource packs enabled, and a sheep face disapears and reappears in a block of wool. Here is proof.

Now is there any update that I wasn't aware of? NO! Im using 1.12! This is the weirdest thing in the world! For now at least