Thee dehydratated bits of corn cob seem to have worked really well. I'm rather surprised!
They look similar to the dried corn cobs I've seen in pet shops - although mine are sections of corn cobs rathar than whole cobs. This as so that I could dry them more evenly.
I didn't dry them fully - no point in that. I let them cool in the dehydrator, then I put them in an airtight tub, to prevent them reabsorbing moisture fromt the atmosphere.
I haven't tried them out on the Girls yet, I'll do that next week. Hope they like them.