Introducing the newest membee of the family. She was ID'd as a female at my local Petco. I see a small flap, and I think its a girl. I just ask for more experienced set of eyes to confirm. Thank you in advance.
Seeing a flap is in reference to sexing molts - spermathecae appear as a little flap on the inner surface of the molt. I'd be rather alarmed if you were seeing a flap on the outside.
What you're looking for in ventral sexing is an obvious slit/furrow. Males will generally have narrower/shorter furrows that are sometimes broken by a little dot in the center, while females should be long and have a lip-like appearance, though it varies from species to species.
I wouldn't trust Petco to sex a mouse, let alone a T. That being said, I agree that it looks female - 0.1, as viper put it.
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