My daughter just gave these to me today and I want to know their sex before I name them. Don't know how old, they were just bought from a pet store. I appreciate any help!
My daughter just told me that the store she bought them from said blue was girl and yellow/green was boy. It hasn't been a full 25 hours since I got them, but there has not been on chirp or anything! They are exploring their cage now and not huddled in a corner anymore though.
You can't really tell their gender 100% unless you have then tested by a veterinarian but when they hit the age of about 7 months they should be mature their ceres will change color male will probably be blueish and female will be more of a tan/brown color.