So my top mother hen decided to leave 3 chicks behind and stick with one runt that hatched. In an egg-topsy, the eggs she refused to sit on any longer were deformed and dead in the egg. But this one little runt is confusing me. (s)he's almost 8 weeks old and is growing very slowly. (s)he eats and drinks enough to get by but spends the most of its time trying to huddle under mom because of its tiny body. I almost wonder if she has some kind of defect. It has smooth wings with a silkied body and even extra toes. Anyone know what could cause both feathering or why her growth and behavior is so abnormal? Thanks for any input!