That triple hybrid should be easy enough to reproduce, if anyone had the energy, resources and resilience to negative comments to do so!Our memories are very similar! It is difficult to comprehend now, but photography was not commonplace, and I bet there is nothing recorded. My memory of the triple hybrids was that they most resembled a Reeve's in type and size with a long flat tail, and were dark and 'smudgy' in colour, but you could see all the parents spp in them - at least once you knew!
I don't have any memory of what the Turkey X Peafowl were like; but only as a schoolboy I can remember the two Turkey-Pheasant crosses. They were the same in appearance and presumed to be either females or asexual. The colour of a pale hen pheasant (of the Formosan/Chinese Ring-neck types) they were more pheasant like - but huge, the size of a turkey hen or peahen, if not larger, and heavy in build. For a kid who had only seen pictures in books, they reminded me of a female Capercaillie - although much paler in colour.... I guess their father was the white(?) turkey semen, but there was no mention of their mother, just a 'common' pheasant.
F.E.B. did of course have a hen Capercaillie in the early 70s, first one I saw. Also a single Blood Pheasant, pre-dating the Iain Grahame imports.

