There are a lot of people that claim that you can tell by the shape of the head, eyes, color of the tail... All sorts of things. But- You can't- Not with 100% accuracy. Sometimes, people will get it right MOST of the time, based on one or more of these methods, but DNA or surgical is the ONLY way to know for sure...
Get her/him DNA'd- It isnt that expensive.... We had
Avian Biotech do the test. I did the feather test, which is about $24.00. If I had it to do over, I would have used blood- Poor little marlow just didnt understand why I was plucking feathers from her!!! I dont think it hurts THAT much, But she made me feel really bad about it none the less...
-Andrew