My Friends corn snake Doug died today. He was only a month or 2 old. We are not sure what killed him. his eyes were dried up and sucked into his head so we assume he was dead for a few hours before we found him. He also has a greenish clump in his body... Is that what killed him? What is the green mass? How could he of died?

heres a pic of the green stuff. http://img15.imageshack.us/i/imag0094t.jpg/