i live on a farm. i help save the unwanted. first batch 2 out of 10 died. figured because they were like the weak links n could be why. they came from a not so good area n were picked on alot. the others no issues. then saved another 30. almost every day since two weeks ago thought something was getting into my farm n killing them. but the ones i saw whole n uneatened by my pigs. sigh. had nothing visible to suggest were killed by an outsider. its starts with cough. sneeze. n what not. one i watched it litterally have a seizere n then there was a bunch of mucas around its face when we went to figure what was what when it finally stopped moving. what is taking my chickens down. hasnt affected the ducks. or the pigs. but my turkey is now coughing. n dang it i really do not wish to loose anymore. sounds upper respiratory to me. some advice would be much appreciated. n thank u. have clean hay n straw. fresh water n food each day. no changes minus being moved to a bigger free range area with fencing where before they were confined with hundreds of others in a little area.