Hi, Some years ago a peach face flew into our yard and I caught it using a cage. At the time it shared an aviary with 5 cockatiels and 1 budgerigar. Soon after I saw the female budgerigar court with the peach face, the female budgy regurgitated food into the mouth of this peach face so I purchased a male budgerigar and now they (both budgies) finally are courting. I have a log in the cage the water bowl sits on. I want to purchase a partner for this peach face but cannot tell its sex but recently its behaviour may provide an indication. Recently after throwing into the aviary some native grasses for the birds to eat, I noticed the peach face collected dry grasses, cleaned them and shoved them into the feathers of its back and then proceeded to go into the log in the aviary and build a nest. Does this nest material collecting behaviour indicate gender?