Hurrah - all done in time and emailed off to the publisher!
It was also at this stage that I was adding the new characterisation to each animal, as I went along.
I had to find a way, not just to squeeze everyone in, but also to show off their various 'swaps' in a way that let you see everything clearly, to avoid visual confusion (whilst still remembering not to put anyone's face anywhere near the page gutter). Nightmare! Only, actually, when it came to it, I managed okay. Maybe because I had warmed up on the rest of the book.