Yeah, certainly orcas can make some pretty high-pitched squeaks. But I&#x27;m guessing they can&#x27;t interbreed with blue whales.<p>I guess I find the blue whale + fin whale hypothesis a little odd (why would the hybrid have a call that&#x27;s higher in frequency than either of the original species&#x27;?), but I don&#x27;t have the expertise to comment on it.