Wonder Walk – Spooky Spiders. Ipswich River Wildlife Sanctuary. Topsfield. 1:00 p.m. to 2:30 p.m. All spiders spin silk, but not all spiders make webs to capture their prey. How does a spider spin a web and not get caught in it? Come find out the many ways these fascinating little animals use their magic threads. For families with children 3 years and older. Registration required. $9 adults, $7 children (discount for Mass Audubon members). Rain or shine. 978-887-9264.