What Has Eight Legs and …? by J. Jean Robertson
Spiders Spin Webs by Yvonne Winer
Be Nice to Spiders by Margaret Bloy Graham
Spider facts, spider identification and a sweet classic can be found in these books. There is a great explanation about how a spider constructs its web at http://ednieuw.home.xs4all.nl/Spiders/Info/Construction_of_a_web.html.