It seems that the Audubon Society has decided to make high-resolution versions of ]every one of John James Audubon's plates from "Birds of America" available for anyone to access and use as they see fit (for instance, I'll be using them as desktop wallpapers for the rest of my computing life). Clicking on any one of the birds listed, brings up an info page, and a link to a high-resolution version of the plate.

This is awesome, and worthy of your time and attention. As is the Audubon Society more generally.

Enjoy!