Chick/pullet activity level

[ZHens]

Hi all,
I'm new to raising chickens and I'm hoping someone with more experience can set me straight. I recently bought 4 pullets, 2 Silkies and 2 Polish. The Silkies and one of the Polish are 9 weeks old and the second Polish is 10 weeks old. The older Polish is quite a bit bigger than the younger one. She seems alert and is eating and drinking well, but she spends a lot more time resting than the other three. By resting, I mean comfortably seated in the grass, generally with her head erect - the way a broody hen looks in a nesting box. Is this within the realm of normal, or does it signify something might be wrong? Any thoughts would be much appreciated!

Interestingly, both Polish pullets are much calmer and more developed (fully feathered and looking like small versions of mature birds) than the Silkie chicks, who's adult feathers are only starting to come in.

 

[azygous]

The behavior bears watching. If this chick spends a greater amount of time in this pose, if she walks a few steps and sits for a bit, walks a few more steps and sits, the chick may have leg issues or worse.

Ten weeks is the most common age that Marek's begins to produce symptoms, leg weakness being a common symptom.

 

[ZHens]

The behavior bears watching. If this chick spends a greater amount of time in this pose, if she walks a few steps and sits for a bit, walks a few more steps and sits, the chick may have leg issues or worse.

Ten weeks is the most common age that Marek's begins to produce symptoms, leg weakness being a common symptom.

Thank you - that's good to know. She was supposedly vaccinated against Marek's, but I'm not entirely confident in the information I was given.