Gathering eggs tonight I found our 1 year old Australop dead. She was fine this morning when the kids checked on them. I looked her over and couldn't see any obvious cause. With the warm weather yesterday we let our flock of 12 free range. Could she have eaten something that poisoned her? None of the other hens shows any sign of sickness. We feed the pellet food from tsc - could she have chocked on it? Do chickens have heart failure? This is our first sudden death and I'm looking for any ideas. Thanks.