I have a family of D'Uccle chickens. Well, had. While the hen was sitting on eggs, the roo was picked up by a hawk. RIP Luis. Anyway, their daughter who is shy of a month old now, I noticed seems to "shiver" a lot. I thought maybe it was because she's cold. She is the smaller and weaker of the two, and it doesn't help that she was attacked at 2 weeks old by another hen that almost killed her. I don't think that has anything to do with it though, because she was tremmoring since she hatched. Suddenly today I remembered when I first got her father, I would notice sometimes that he seemed to be shivering too. I had also seen hock sitting behavior out of him on at least one occasion and once a full on spaz out/seizure. This was quite a while back though and I had forgotten about it completely. He was at least a year old at that time. I have looked into Avian Encephalomyelitis, but I don't think this could be seeing as its a virus, and I have never seen any other signs of this in any other members of the flock, including the little chick's mother. Is there maybe something genetic specific to D'Uccles? Or could this just be a coincidence, and the little gal is just cold? Her brother (not a D'Uccle) never shakes either. What do y'all think?