It must be a pet that you want Kathryn since it'll be you who ends up looking after it. My DC had all sorts - dogs, cats, gerbils, rabbits, Guinea pig, stick insects, hens - and eventually a pony. But I didn't work full time - and it was me that ended up looking after all of them. Suited me as I loved having my own little zoo (I really wanted a snake). I would advise against anything that has to live in a hutch outside as they easily get forgotten, especially in bad weather.
Having said that, hens make surprisingly good outside pets. Properly handled they enjoy being held and stroked, 'talk' to you and come running when called (albeit for food).