I have 2 cockatiels, 2 yrs and 2 1/2. The last couple of days the older bird has been getting on the other ones back as if she was trying to mate. supposedly they are both females... Now the younger one is sitting on the bottom of the cage and swaying back and forth during the day, but perching at night. I am worried because she was egg bound in Jan. Could she be getting egg bound again.. and how long does laying an egg take? Do cockatiels come into heat even if there is no male present?