Ok, two days ago one of my outdoor rabbits died (I had four). They live in a sectioned off area of my yard and have been doing very well there for the past 3 years. With one rabbit gone, I was very concerned but now. NOW I get home and TWO MORE are dead. Same M.O. no attack wounds or discolouration at the mouth, just kinda flopped upside down. I'm taking that remaining one inside but are there any ideas to what is happening?