My daughters Welsummer (Sally) just died. It was very fast & horribly sad. We were out playing with the chickens around noon-1pm & they were all fine. Then @ 330-4pm I went to take them some watermelon rind. When we found her she was sitting sort of limpy in the corner of the run, the other 7 were inside the coop in the shade. (They were panting, but not as bad.) She was breathing heavy, with the opened mouth pant. She seemed to cough a few times. For info: Its Northern California and we've had a heat surge recently after an extended winter & pretty much no spring/springy nights only. Upon reaching for her she stood up and hobbled around. She seemed almost drunk. She hopped around oddly, flapped her wings a few times and it almost seemed like she was having a seizure. I got a kitchen towel and wrapped her up and brought her inside to the bathroom. I put her in the tub, offered her water, food & treats. She refused food & treats but was drinking water like crazy. I had my oldest daughter bring me a spray bottle of cool water. I sprayed her down and she seemed to perk up and she actually seemed to play in the mist the next couple times. She pooped...but it was clear/white and runny. She stayed stationary for quite a while. Then she hunkered down...almost squatting & seemed to close her eyes. She was sleeping. Any little sound and she'd open her eyes and almost seem irritated. I sprayed her down a bit more, she drank more water. She seemed to gargle and play a bit off and on. Then she pooped again...same, whitish clear runny. I kept rinsing it down the tub so she wouldn't lay down in it. She drank some more, made a few sounds and hunkered down again. Then all the sudden I decided to close the shower curtain about 1/2 way. My oldest daughter walked in to pick something up for me and thats when it happened. She made a horrible noise and started flapping around...wings, body & all. She flopped from one end of the tub to another. I closed the curtain so my daughter couldn't see. She continued for another 1-2 minutes off and on and then stopped. I checked on her and she was gone. To make sure I sprayed her with a bit of water and there was nothing. My husband confirmed. What the HECK can take down a chicken that fast? Could it have only been heat? We are so confused. No symptoms other than listed.