When can I tell the sex of my gosling?

[Sasa]

I have an 8 week old Toulouse gosling who I am hoping is a gander. At what age can I tell? I know at some point they start "posturing", what exactly does that mean, "posturing"?

 

[whytedragon]

Well I'm new to geese, but I wanted to know..so I watched the Metzer video on vent sexing, and was surprised how easy it was! It even helped me to sex all of my ducklings. Good luck!