A good book for units on insects, or on habitats, or on animal adaptations/camouflage.  Or just a fun book for kids who like to hunt for the hidden things in a picture, and who like bugs. One two-page spread showing and telling briefly about a particular habitat, with all the bugs kind of hidden, is followed by another two-page spread showing those bugs on a plain back-ground and giving more detailed information about each.  This set-up allows the reader to test their eyesight hunting for what they think they see, and then checking their finds when they turn the page, going back when necessary to find something they may have missed the first time through.