This could be a trait of the breed, if you ordered docile breeds, if it has been this way from day one, it is probably nothing to worry about, it may grow out of it, it may not like the attention of the other chicks so it try's to be un interesting to them so they wont bother it.My daughter's favorite chicken isn't as mobile as the others. She usually just sits in one spot all day and doesn't move unless she needs food or water. She still eats and drinks, should I be worried? All of the other chicks are active and jump around.