I have just recently gotten two pearl cockatiels and I have no idea what genders they are. They are both pretty vocal, but I don't really know what to look or listen for in terms of 'singing' or just chirping. They do sometimes try to mimic a wolf whistle when I do it first. I have pictures here of their faces and their back/tail feathers. I got them on September 12th, and the lady I got them from said they had just been weened. They can't be more than 16 weeks. I appreciate any knowledgeable advice, thanks!