I'm going to go against the grain here and say that there is an age/size where balls will start to differentiate by sex. I'd say in the 800-1000 gram range is where males and females start to "look different". Body type and tail shape/length are fairly solid indicators of sex after a certain size/age. Not fool proof by any means, but I'd bet that plenty of people can pretty accurately tell sex visually.
Reply With Quote