Midrash su Levitico 11:15

4) (Vayikra 11:15) ("Every raven after its kind") "raven": This is the (black) raven; "every raven": to include the "deep" (i.e., white) raven and the pigeon-headed raven; "after its kind" (lemino): the starling; "after its kind" (lemineihu, Vayikra 11:16): to include the swallow.