http://chelsea.sevorg.org/ or check out her etsy shop at http://www.birdnerd.etsy.com/. She was also a featured seller on etsy so if you really fall in love and want to read more... http://www.etsy.com/featured_seller.php?featured_user_id=34858 here is yet another link.
My favorite items are her smaller pins, I put them on my felted bags and other knitted items to spice it up a little. I also love her linocuts and I think my favorite bird is the cardinal. Of course you can decide for yourself, but it always wins me over.
Here is a note from her etsy homepage::
Our Feathered Friends are in danger! If you would like to learn more about our diminishing birds please copy and paste this link to Audubon and sign this petition: