Commentary for Zevachim 138:16

עוף טמא לר' יהודה מנבילה נפקא ליה

is necessary in order to exclude an unclean animal,<span class="x" onmousemove="('comment',' The heleb of an unclean (i.e., forbidden) animal does not defile.');">¹⁶</span> [for it intimates:] only that in whose species there is terefah: hence this [a unclean animal] is excluded, since there is no terefah in its species.<span class="x" onmousemove="('comment',' Only the heleb of an animal which can become terefah defiles. But an unclean animal, which cannot be eaten in any case, can never become terefah in a technical sense, and therefore its heleb does not defile.');">¹⁷</span>

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