Madeleine and Henry were my first puzzle book lovers. We've spent many hours reading this one. (I had to take photos because the large square size of the book doesn't fit easily on my scanner.) The instructions are given in the form of letters and a code around the outside of the pictures tells you which animals are hidden. Some are harder to spot than others. I wouldn't recommend it as a bedtime book (there's too much to think about and do), but it makes for a nice rainy day activity.
I have one husband, three children, two cats and a house full of too many books to count. I love to read, ride my bike, bake, develop my own photographs, and I've been known to neglect all housework to play with my kids.