Which one is not like the others?

(L-R: Yellow band, Green band, Red Band. Middle: Blue band sans band)

The chicks are now 22 days old and growing rapidly into spindly raptorish looking things - except little blue-band who is not wearing it's band as it's so small even the "baby chick" size kept slipping off! It's not even half the size Green and just half of Red and Yellow. There is plenty to eat and no bullying plus they get plenty of bugs hunted in the garden so it's not as if it's for lack of grub- it's just plain small and has more of the rounded features of the baby chicks. Despite this it is feathering up faster than Green or Red but slower than Yellow band.

Meanwhile Red, Yellow and Green chicks have graduated from little chick leg bands to big chick leg bands. Green is the largest and imo going to be a boy. Yellow and red are pretty evenly matched size-wise but yellow is feathering up faster, having some feathers on her shoulders and just starting to sprout them on the sides of her chest. (You can barely see this in the pics.) All of them remain pretty placid little critters especially compared to the fruitcake Faverolle! For this photo I pretty much ploinked them on top of a towel on a table in the position I wanted and they calmly stayed where I ploinked them - neatly in order - and waited while I stroked their tummy up to a standing position instead of nodding off! (Yes, seriously, they nodded off after being ploinked! O_O)