Nest for a Trumpeter swan...There is a how to on Instructables (see GroveCanada there)...Far left shows the Sisal rope prototype...This one is water-resistant ropes at 750 feet in diameter 3/8 of an inch...(I made 8 different ones to get the design right...) About 43 to 48 inches in diameter...by Sari Grove, with help from swan fanatics...(also got help from Pepsi art grants)...