Vent sexing does not seem easy to me. My feelings about it aside, I find it difficult to clear away all the down to get to the vent. In addition, the babies wiggle, and its tough to see if I do manage to get them still for a moment. I guess maybe a magnifyer w/a light that clips on a table might help, but getting them upside down in my hands while searching for the vent is not for the faint of heart. I did watch the Metz.. video showing ducklings.