Don't yet know if it's a male or female but it sure is a different story to Big Bertha - who I'm now sure was ill when I got her. This one rampages round the tank devouring anything I put in and doesn't seem at all afraid of the goldies; it just pulls it's horns in and keeps moving! It's so lively I just love watching it - but what to call it? I keep trying to see inside the shell for sexing but no luck yet!