Board Thread:Lore Discussion/@comment-25291590-20130317093523/@comment-6707115-20131109194301

The book simply says that claims of interbreeding between Daedra and Betmer (Khajit, Argonian, goblin, etc.), and mer and man has yet to be proven. As there are stories (probably legends or folklore) about it, but none has been corroborated. As for the orsimmer, they aren't a beast race (Betmer) they're a type of elf. Proof is present in the Grey Prince's existence.