Walter Burgess: Sexing 101 - Species # 51 - Lagonosticta rhodopareia - Jameson's Firefinch :
Sexing Birds
These articles will help you tell the difference between mail (cocks) and female (hens) of various bird species.
Walter Burgess: Sexing 101 - Species # 52 - Lagonosticta rubricata - African (Blue-billed) Firefinch :
Walter Burgess: Sexing 101 - Species # 53 - Lagonosticta larvata vinacea - Vinaceous Firefinch :