I found these neat books at our public library. They are published by Pebble Books. Their website is www.capstone-press.com. The series we are reading is Insects and the some of the titles are Ants, Beetles, Bumble Bees, Cicadas, Crickets, Dragonflies and Fireflies.
These are nice, short books for younger children. They have a photo on one page and then a sentence describing the photo on the next page. At the end of the book there is a vocabulary list and also a list of related internet sites and more books. These books are at the K-1st reading level. Graham enjoyed reading these to Josh and Will. They were short enough to keep Will's interest and Josh loved the pictures (lots of great detail).
Our library has the insect series and we are currently reading through them. They also publish an animals and science series.
Here is a link to the page with these books.