In Non-human Animals
The vagina (along with the penis) is a general feature of animals in which the female is internally fertilised (other than by traumatic insemination). The shape of the vagina varies among different animals.
In placental mammals and marsupials, the vagina leads from the uterus to the exterior of the female body. In birds, monotremes, and some reptiles, it is the homologous part of the oviduct and leads from the shell gland to the cloaca. In some jawless fish, there is no oviduct nor vagina and instead the egg travels directly through the body cavity (and is fertilised externally as in most fish and amphibians). In insects and other invertebrates the vagina is part of the oviduct (see insect reproductive system).
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