National Audubon Society

"From the creators of the world's most trusted field guides--a go-to source for millions of nature lovers--comes a completely new and unparalleled reference work: the most comprehensive, authoritative, and up-to-date guide to the trees of North America. This master guide is the result of a collaboration between leading scientists, scholars, taxonomic and field experts, photo editors, and designers. An indispensable reference, it covers more than 700...

Birders know you need the right house to attract the right bird. An entrance hole that's 1/8 inch too big or too small spell trouble, as does a roof that leaks or a floor that doesn't drain. Learn to build safe, species-appropriate houses for your favorite birds.