Natural Weapon Ranger question

[Momo Kimura]

If I dip two levels into Ranger to get Improved Natural Weapon (Claws), can I at third level as a fighter dip pick up Improved Natural Weapon (Bite) or do I have to wait until sixth level as a Ranger to pick that up next?

[DeltaOneG]

If you already have a bite attack and a BAB of 4 or greater then you qualify for the feat and can take it.

Not sure if that's society kosher but it's RAW.

edit: but it does not count as a combat feat so you can't take it as a fighter bonus feat.