Alpacas: The Unique Mammals with Direct Uterine Insemination

Alpacas are the only mammal known to science in which the male injects sperm directly into the uterus. This unusual method of reproduction causes small internal damage and may help increase the chances of pregnancy.

patricia brennan He and his team at Mount Holyoke College in Massachusetts examined and dissected the reproductive systems of 10 female alpacas that were euthanized within 24 hours of mating. They found bloody abrasions all over the reproductive organs and the male alpaca…