Two-faced kitten born

A kitten was born in Ohio earlier this week with two faces.

NBC reports that the kitten, which is yet unnamed kitten but likely to be called "Tiger", is doing well and is feeding normally, despite having two faces on the one head.

One word stands out by its absence from the news report like Mt Fuji: mutant. I can't help but wonder why NBC choose to write "veterinarians don't understand why" the kitten was born that way rather than call it like what it is: a mutation, even if we don't know the precise cause of the mutation.