I just got my first ever "flock". Three of them are 18-20 weeks old, one is much smaller but forgot to ask how old it was. Ive only had them a couple days, but only the biggest (a flightly black rock) has shown the ability to fly up onto things and jump. They are not used to their new coop yet so I had to force them in, once inside I think its too dark for them to see what they are doing. So they just calm down and stand in once place. So I manually place each one on the perch bar I made. They grip it well and seem confortable, but it seems they have no clue how to get off it again by themselves. Even in the morning when I open the door, they dont jump out. They wait sitting on the perch like they dont know how to get off. It is winter here now and the days are very short, nights very long. Sunrise seems to be 8.20am and sunset at 4pm. It seems almost cruel to leave them on a perch for so long where they do not know how to get off/move around. But if I left them on the floor of the coop they might not get comfortable enough to sleep?