From YardMap‘s Facebook page:
In an increasingly fragmented and anthropocentric landscape it can be difficult and time consuming to locate enough high quality building materials to make secure and well insulated nests.Many birds will resort to using dangerous materials like plastics, garbage or even cigarette filters. Leaving out piles of natural building materials will help provide birds the supplies they need as well as saving them time and energy that is better spent building, incubating, and raising their young.
Offer broken-up sticks of different sizes, wool or cotton batting, feathers, coconut fibers, untreated animal fur, horse hair, moss, mud in a bowl or puddle, even spider webs and snake skins!
Check out our nesting materials Pintrest board for more ideas: https://www.pinterest.com/cornellyardmap/offer-nesting-materials/
For excellent nest information and an opportunity to take a very active part in the nesting going on in your yard visit: nestwatch.org.
Ever wonder if there is more you could do in your yard and garden to attract a greater diversity of birds, bees, butterflies and other wildlife? 
It is a great resource to connect you with gardening and wildlife professionals, as well as other citizens like you, who share similar interests. There is an online forum to help answer questions, and you can join others in your area to form a group to do special projects. By registering your data and through updates, you can assist scientists in their studies of trends in wildlife populations and diversity.
Another organization, 
NWF also publishes Ranger Rick® magazine for kids and have programs to get kids outside and involved in learning about the habitat and wildlife around them. A special educational program designed for teachers is also offered and can assist in certifying schools as Wildlife Habitats for ongoing nature study.
Each of us has a part to play in creating a healthy environment for ourselves, our children and community, which naturally extends to our wild neighbors as well. Please consider making your yard a haven that welcomes all.
Eliza Waters 