Reference for Chullin 40:10

מבהמה כולה מילתא כבהמה

But, according to the one who holds that birds do not require shechitah by the law of the Torah but only by Rabbinic enactment, and the Rabbis obviously derived this rule only by a comparison with cattle, surely then [birds] should be compared with cattle in all respects! - Rabina answered: Rabin B'Kissi told me that the dictum of Rami B'Ezekiel, namely, the fact that the organs have been torn loose is not a defect in a bird, is to be applied only to the case of nipping, but in the case of slaughtering it is certainly a defect.

Jastrow