Interesting books

My 1.2 year old girl has recently made a passion to pull out books from the shelve.

We placed a special shelve with kids book just she will "focus" her destroying efforts toward her books.

But she got bored and she went to my IT books. It was funny as she started to pull out Oreilly books. Why?

Well, I sneak behind her and watched her silently. She went to the shelve, look for a while and put her little finger on the small animal figure each oreilly books has - and then she pulled out the book.

Ok, so that is the reason Oreilly IT books are appealing to kids - they have animal pictures on them :)

My question is, how much of the decision to buy such a book is due to the fact we like those pictures too?