I am thinking of a book that I checked out from the school library about 100 times in the mid-late 80’s
It was a picture book and each page was fully illustrated with animals. There was one page per animal, and went from A to Z. Some if not all of the animals were exotic. I remember wondering “what the heck is an ibis?”
So the pages went from A to Z. Each 2-page spread would name one animal that starts with that letter. The pages were covered densely from edge to edge with drawings of that animal. There was also one example of the animal illustrated and you had to find the matching illustration on that page, which was quite challenging. So it was an animal book, an abc book and a seek-and-find book.
I remember each page being colored background (maybe different colors for each animal, seems like mostly dark, rich colors like crimson), and the print might have been black only but I am not certain about that. It wasn’t white pages though, I am sure of that. I am almost certain it was a hardcover book too.