Towards the end of the 1800s it looked like wood ducks were headed towards extinction.The Migratory Bird Treaty Act of 1918 is credited with saving the species, but many also credit the invention of the wood duck box in the 1930s with their conservations.For WXPR’s All Things Outdoors, Katie Thoresen and Wisconsin DNR Conservation install some wood duck boxes in the Northwoods and share how you can as well.