When I got my ducklings at TSC they asked me if I wanted girls or boys and I needed 2 female. Apparently if you hold them on your back if they hold. I think legs close to their body its a female and if one or both stick out its a boy. The 2 that I got did keep their legs to their body and the other stuck one out so I'm thinking this could actually be true. If Any of you have a duckling and you know the sex could you try it and see if this is true?