If you were walking somewhere long distance (a several day walk), and for some reason, you needed to take a hen with you, how long do you think you would be able to carry the hen before it would become pecky and wriggly and generally not keen on being carried? How long do you think it would need to spend pecking and doing hen things before you could reasonably pick it up and carry it some more?
Would you stop and make a cage for your hen (you cannot buy a cage, civilisation has collapsed), or would it be easier to carry her on her own? For that matter, could the hen walk, or would she need carrying?
I know nothing about hens, and although I am tempted, obtaining hens as a form of research seems a Step Too Far.