I have 6 ISA Browns and from what I have read, other peoples hens of this breed are really friendly: jumping up on them to be petted. My chickens are friendly enough as they eat out of my hands and are really nosey, but they don't climb on me and when I go to pick them up they walk away or try to escape. Is there anything I can do to make them want to be petted as my daughter loves to play with them?