Photograph of a pregnant uterus from a New Forest pony, approximately five months into the pregnancy.Photograph of a pregnant uterus from a New Forest pony, approximately five months into the pregnancy. The developing pony fetus is outside the uterus but remains attached by its membranes. Its vast blood supply can be seen on the inner surface of the uterus. This historical specimen is stored in a container 48 cm x 30 cm x 7 cm.