Rooster's walking upright

[Arifox]

We got these three roosters last night. Two of them are walking very upright...should I be concerned?

 

[aart]

They are probably just staying alert and checking thing out.
As long as they are eating/drinking/pooping and moving around OK,
I'd not worry.

Why do you need 3 males?
Probably too late, but:
Consider biological/medical quarantine:
BYC Medical Quarantine Article

 

[Ridgerunner]

Different breeds can have different posture and body conformation. Do you know what breeds they are? For that matter, where in the world are you located? Those may be local to you.

 

[Shadrach]

They look like game birds or game bird crosses to me. I don't know what breed. In general game birds have a more upright posture than the more common domesticated chicken.