Thrumbo herd

[agnar]

I am unsure they should be still in the game, because i remeber Tynan said in the alpha/beta unstable thread that they were removed.
https://ludeon.com/forums/index.php?topic=36208.msg375324#msg375324

Got them twice today.
https://imgur.com/a/5jkVT

Or is Animal migration =/ herd?