My children have a flock of Araucana Chickens (because they lay pretty colored eggs) and I've noticed that the Rooster has recently started walking funny... he usually struts all over the yard ruling over his hens, but lately I notice he stays behind, and when he attempts to walk his legs tremble and he looses balance then falls to the ground. I've been searching online and according to an online poultry disease website I found it says that it's either botulism or Marek's disease. Both have similar symptoms listed (trembling legs, paralysis, etc.) only there is one symptom not listed on either.... Without much effort I noticed his tail feathers come off... he's not moulting so I know it's not that. I've checked them all for lice/mites, and there is nothing. My kids normally eat their eggs, and I've stopped gathering the eggs until I know for sure what is going on. I've also isolated him from his hens until I have a more definative diagnosis. All help is greatly appreciated... my kids love "Rusty the Rooster!"