Kev, as far as I know they're mutts, Rhode Island Red crosses, nothing special. I know of one person who has Buff Orpingtons and Golden Comets, they eat slugs, too. Maybe it's the type of slug? I dunno. I'll find out this spring when we get ours.
Wow, please let me know. I might be willing to drive your way to get chicks if they'll do slug patrol.