Just found another interesting X-Files/GB tie. I promise this one's better than the last. OK, there's an XF ep called "Teso Dos Bichos" that features a lot of animals, from rats to cats to a jaguar spirit. Anyways, it seems that none of the actual animal sounds were used, but were provided by...that's right: Frank Welker!! That man has talent to give away. Of course, you can bet that nearly any production with an unusual sounding character will have Welker, I mean, he's been doing it for over 25 years.