As said...the cow in itself is not bad. I still do not think it fits. Especially when only ONE race we can choose from atm comes from the underdark.
My way of tackling this would be a race specific shape or the ability to choose a new one from a list when reaching the appropriate level. So the base transformations are the same for everyone but the higher lvl shapes are an individual choice. That can also represent the type of druid you want to play.
