i picked up 2 hand tame cockatiels 2 days ago and am totally in love the woman told me it was 2 girls..but i beg to differ. i had a male back in england (he always whistled, was oh so friendly and did that rubbing his bits against the perchs thing(!)) one of these 2 is doing the same. it whistles and 'sings' all day long, the other is pretty much silent apart from the rare screech. but....the one i suspect is male is grey and white..it has no orange 'cheek' patches at all (dont males have the brightest orange cheeks normally?) the one that i think is female has barred feathers under her tail but has really bright orange cheeks??? im confused. they are both around 10 months old....if they are m + f.....at what age do they begin to breed? what size nest box do they need?