Cornel Labs Ornithology is looking for volunteers to provide information about birds' nests in your area. One of the birds they are studying is the Northern Cardinal. I started a thread in the Bird Watching Forum with more information but wanted to post something here in Wildlife for those who might not see it over there. Here is the thread in Bird Watching where you will find more detailed information: http://davesgarden.com/community/forums/t/1112623/
NestWatch - Cornel Labs Seeking Info on Birds' Nests