With your "normal" cockatiels, at least in the wild you *usually* can tell by looking at them, but I definitely see what you mean. Especially in captive breeding, we have so many different mutations that you just don't see in the wild. My cockatiel is a pearl, and while I am pretty certain he is male, he hasn't lost any of his pearling. I know that males usually do, but sometimes they don't. Not sure I have the heart to pluck feathers or purposely cut his quick just to know his gender though.When does your dna test come back?
I wouldn’t bank on your bird being a particular sex simply from what you see and hear, you really need a test unless you know the parent birds and understand mutations etc - we’ve had numerous members here believe their tiel was male (going in visuals and behaviour) till one year their boy bird dropped an egg- female tiels with male names is fairly common lol.