Ugh, the other day I heard a Petco employee (he's a real jerk btw) telling people, they were deciding between a cockatiel, budgie, and a green cheek, 'Oh, yeah PARAKEETS can entertain themselves, they don't really need space or toys,' then about sexing cockatiels, 'Yeah you can tell this ones a male and this ones a female based on how bright they are (they were probably both under 6 months based on their big eyes and both had barring on their tails, if anything they were both female), he then tried to force the conure to step up, while it was running away from him and trying to bite him. They ended up getting the conure. I resisted the urge to correct him, but of course, I didn't.