Well, I was wrong - she likely had Avian Leukosis. I lost a second chicken the next day (she had shown signs of being ill only the day before). One of my friends is a Vet that works for the NYS dept. of AG & Markets - she picked up the second chicken & sent it to the state for necropsy - she confirmed Avian Leukosis in the second chicken. It's possible ALL of my chickens were exposed from the hatchery. The disease is passed from hen to chick, then laterally from chick to chick for a very short period of time post hatching. Since they shipped at one day old, they were all potentially exposed. Time will tell. I contacted the hatchery (highly rated) but have not gotten any response. I hate to trash talk about anyone's business, but I would not recommend dealing with them. What's strange is that Avian Leukosis is present in about 18% of commercially produced eggs (supermarket eggs). Before this I had never heard of chickens with cancer. With the days getting longer, I am getting 9 eggs from 12 chickens so they seem to be pretty healthy - we've had an easy winter so far, chickens have beenable to get out far more this year.