Belko vs. Joe - "If an infant animal of another species is adopted by a Bird, they have legal rights to be called a Bird."*

*However, we must also reference ratio laws concerning adoption and naming rights.

As cited by u/CharlieKellyAMA:

"Okay look, we don't know yet if the pupper is now a birb, or if the birb is now a pupper. The ratio is off. What we need to do is introduce another bird, and based on the reaction, we'll be able to tell whether the subject in question is a birb or a pupper."