One of my players (Halfling Bard 3/Rogue 1) found an axe beak egg and hatched it. My setting is a low magic/low treasure world, so I put the axe beak egg there as "treasure" with the intent of the party doing something with it. I ruled that eventuly it hatched and it's about 2 weeks old.

I never considered rules for how to train this thing. Any ideas? I don't want to give the play free druid/ranger powers so I will have complete control of the thing and it's generally pretty ornery, so It's not going to listen all the time.