I am moving in a few days and I have been reading posts about how to transport chickens. I have two White Plymouth Rock chickens. I read to find a box they would fit snugly in and put holes in it for air or find a cat carrier. They will be in the car for about 3 1/2 to 4 hours. Is that too long for them to be in a box? Also, If any one knows about how my type of chickens deal with cold weather and snow, please let me know. They will be in a a coop of course. I was just wondering if they would be in need of a heat lamp or if they fair well in cold weather. Thank you in advance for any help.