It has to be something that can infect several different types of species and is easily transmitted, or even airborne. Tularemia can infect several species according to a web search I just did on my blackberry. I can't really research it well because I only have access to my blackberry right now and it is very difficult to navigate different web pages. Whatever it is, it sure sounds pretty scary. I hope you are able to get to the bottom of it very soon. Maybe you should burn the carcasses. Please keep us updated! How are they doing today?