how do you sex full sized geese?(PICS ADDED!)

From what I've heard the males are supposed to have higher pitched voices while the females' voices are deeper.

I only have one goose, so it's not first hand knowledge. I didn't have anything to compare with, so I didn't know for sure until I found an egg.
 
DNA sexing is 100% way to know. We have 3 new Sebastopol's we are doing DNA on to know male or female even though we "think" they are all girls. Wish I could be of help from the photos, they are cute though, thanks for posting the pictures.
 
I can give you a way but .... it's not very pleasant and requires two people at least without queasy stomachs.
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First you hold them on their backs in your lap and then the other person sticks their finger up their butt.
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This takes gentle but firm wiggling to loosen up the muscles. Eventually, if the goose/gander holds still long enough for this to happen
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, you can feel the difference or see the difference by gently pushing on the opening to reveal the organs. Besides DNA testing, this is about the only way to know for sure what you have until they mate or try to mate.
 
I wouldnt advocate inserting a finger into the vent but they can be vent sexed by easing the vent open, almost like gently teasing a rose bud open. With experience you can see the penis or female cloaca which appears more 'ribbed'. There's a good link on the Metzer site which has a video for vent sexing.

Pete
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I can advocate the metzer link. I used this to learn how to vent sex poultry, but do prefer to do it when they are small! We recently took on 6 extra geese, and they are very different (same breed) in their vocalising/behaviours. My original group, the females have the deep butch voices and tend to chunter to themselves. The boys have that high pitched squeakier version. The boys tend to front up to me if I am moving around...not attacking, just keeping between me and the girls. Also with my geese I noticed that the boys have a flatter head top, while the girls heads are more rounded. Based on this, I do think my american buff is a boy not a girl...and has paired up with my orphan hatchling of the same age, Solo but so far we think we have a roughly even number of boys/girls.
 
It's nearly impossible to tell the sex of a goose by sight. Generally, the males have a higher-pitched voice and the females have a lower 'honk'. Females are usually more shy than males, though both can be aggressive.

Forgot to add that they are probably not mixed. There are people who have tufted sebbies, though it is a rare, and generally undesirable, trait.
 
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With my Production Toulouse, my three females have the prominent lobe while my Gamder DOES NOT. The 4 younger ones, I have not discerned the sexes yet.
 

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