Nevermind, it was only on a single world, probably because it had been loaded in an earlier snapshot.
Use 1.10, Minecraft 1.10.1 crashes a lot. When 1.10.2 comes out, use that.
That's because the Husks are types of Zombies. They are technically Zombies, but have a data tag that turns them into Husks. Same with Skeletons and Strays.
I have recorded evidence of this happening on our realm. https://youtu.be/hqn_2lWTNB8
The cows consistently tend to go east.