In Audubon's time there was an estimated 3 billion passenger pigeons. By 1914 the last remaining pigeon would die...
What is "The Viviparous Quadrupeds of North America"? Audubon's second monumental project.
Audubon would paint the Great Auk but by 1844 the last bird would be extinct.
Dozens of species of birds can be found at the Mill Grove nature santuary.