Well done Vision! You answers are completely correct, although the last owl-faced monkey from Twycross joined the ones at Edinburgh for a short time before they were moved on. I don't know why everyone else missed that characteristic white stripe
So the 6 photos give 13 animal names - pig, fly, turtle (good value from 1 photo), owl, monkey, elephant, shrew, sable, antelope, rhinoceros, hornbill, butterfly and goodeid (or alternatively splitfin - a reference to the shape of the male's anal fin which acts as a pseudopenis during mating).
Photos taken at Regent's Park, Twycross, Regent's Park (the Clore, many years ago), Chester, Chester and my front room
My thanks to everyone who had a go, I hope it was fun for you.
Alan