A week and a half ago I moved my 3 Australorps into a new pen from their old one. They completely freaked out when I put them in the new pen which is bigger, cleaner, and better lit. I chalked this up to making the adjustment to new surroundings. Since then the birds seem fine during the day but exhibit strange behavior at night. 1st of all they almost always refuse to use their perch, instead crowding together in a corner. 2nd of all they flap around and make a noisy racket when I turn off the lights at night. I dont know what in the heck has gotten in to them. Their pen is in a completely enclosed and secure garage, so there is no chance of a predator scaring them. Can anyone help me figure out what the issue is?