Sieges: Are some units better than others?

[Festin]

Animal tag is supposed to confer a penalty per one of the designer, but in reality they make no difference and no penalty or modifier of any kind is applied to the animal tag. someone did some testing sometime back and confirmed this I believe. I think it's the "lies my rulebook told me" thread if you want to read up.

Wow, never heard about it. Is this really confirmed? And what about mindless units, do they have the penalty?