Someone gave us the Frog Alphabet Book. It never made the read list until about a month ago. Now we read it at least once a day, usually three or four times. It is the book of choice for time on the toilet. Kiddo can recite at least 2/3 of the book.
It is not short. It has taught me about efts, and newts, and caecilians, and where the biggest frog in the world lives (Cameroon, Africa), and how big the smallest frog is. It is chock full of information, all of which Kiddo now knows, because she has memorized the whole thing. And insists on "reading" to us, as well as being read to.
I have got to find her some more non-fiction, to add to her knowledge base.