A good choice would be The Magic School Bus Spins A Web written by Joanne Cole and Bruce Degan.
Many children are familiar with Ms Frizzle and the other characters in this series of books by Scholastic.
With this book, the students will learn lots of interesting facts and some great vocabulary about spiders such as the fact that spiders are not insects! Spiders are arachnids! Spiders have 8 legs. Insects have only 6 legs. Also according to scientists (and Dorothy Ann) you are never more than 3 feet away from a spider! EEK!
The authors explain that there are more than 100,000 kinds of spiders but focus the emphasis of this book on 3 particular kinds of spiders. They explain how these spiders spin their webs and attract their prey plus lots of other interesting facts while Miss Frizzle and her students have another wild adventure!
After reading the book, the kids might also like to view the video.
Here's a link to the video on You Tube:
Also here's a link to another cool spider book and a craft activity (a previous post):
Have fun learning about spiders and enjoy this creepy Halloween season!