This is what I'm thinking, just based on the bonding mechanic with horses sounding like some wild horses are much harder to tame than others. Not only that but just how much crazy shit you can do in this game that you assume isn't possible but people just try it and find out that, yes, Nintendo did think of that and programmed it as something they wanted people to be able to do. We will see.
Yeah, according to Aonuma they had programmers working for 4 years purely on the behavior of the animals, so I would expect lots of surprises from the wild life.