[Junior]

There is one group of birds that have teeth as juveniles, but lack any other reptilian features.

It's true. You can lead a creationist to evidence, but you cannot make him think.

[Virginia-American]

There is one group of birds that have teeth as juveniles

Which ones? I never heard of this before.

[HayekRocks]

There is one group of birds that have teeth as juveniles, but lack any other reptilian features.

Maybe you are thinking of egg teeth? Those are not really teeth. It's just an expression.