The WFVZ houses approximately 225,000 sets of eggs (equal to more than 1,000,000 individual eggs), representing at least 4,000 bird species from around the world, and collected from more than 400 individual and institutional collections. it is the largest in the world and has contributed to multiple scientific fields (e.g., conservation, ecology, taxonomy, and toxicology). The Foundation has more than 18,000 specimens from around the world, representing the largest collection of nests in North America and the world. The WFVZ houses more than 56,000 study skin specimens representing over 100 countries, with the largest numbers of specimens from the United States (>12,900), Mexico (>12,600), Malaysia (>4,400), Costa Rica (>4,000), and Ecuador (>3,800). The skin collection is at least the 16th largest among North American collections. The primary sources for specimens currently are wildlife rehabilitation organizations; wildlife research agencies; birds killed by cats, window strikes, and car impacts; and the Foundation’s own field research projects. Materials are consistently acquired by the Western Foundation and used by researchers, educators, scientific artists, and other museums.