Thanks Kasu! Just out of interest, did you have trouble finding the individual sounds, or did you foley them yourself somehow? Also what sort of things would you tweak with hi/lo pass filters?
I've lost the link, but I read an interesting article about creating creature sounds from a simple human voice. Creating a whole bunch of layers, e.g. pitch-shifted, reverse-reverbed, vocodered, etc, then combining them. It sounds quite promising, although with creature noises because they're much longer (and may in fact be continuous) it seems like it would be harder to hide the repetition of the time signature. I'd think you'd need a way to piece different length segments together almost like a dynamic music system.