Merryspring Nature Center will present a nesting box construction workshop led by Eric Evans on Saturday, March 25, at 10 a.m. Evans, who lives in Camden, is a longtime volunteer at Merryspring and a breeding coordinator for the Maine Chapter of the American Chestnut Foundation. He will discuss the species of birds and other wildlife that can nest in such boxes, and each workshop participant will build and take home a box especially sized for their choice of Saw-Whet Owl, Kestrel, Bluebird/Tree Swallow or Wren. People must register by Friday, March 17, and indicate which bird they would like to build a box for. Workshop cost is $25, $20 for Merryspring members. Space is limited, and prepayment is required; contact Merryspring at 236-2239 or Merryspring is located on Conway Road, off Route 1 in Camden next to Hannaford Shopping Plaza.