Animal wildness lowered with each successive generation

[zeebo76]

It would make sense if when you kept animals and bred them, that over time their offspring would become more tame (less wild).  It would be a VERY slow process, perhaps 1% per generation, but it would add another goal to the game.  I want to make a completely tame Thrumbo!

Tameness could also increase buy/sell price, too.  I'm sure that selling a 50% wild Thrumbo would net a LOT more than selling a 98% wild Thrumbo.