Przewalski's horse [SEP] IUCN conservation status
pool. In October 2007, scientists at the Smithsonian Institution's National Zoo successfully reversed a vasectomy on a Przewalski's horse — the first operation of its kind on this species and possibly the first ever on any endangered species. While normally a vasectomy may be performed on an endangered animal under limited circumstances, particularly if an individual has already produced many offspring and its genes are overrepresented in the population, scientists realized the animal in question was one of the most genetically valuable Przewalski's horses in the North American breeding program. The
Minn: ABDO Pub. Co, 2006. Print.
- Wakefield, S., Knowles, J., Zimmermann, W. and Van Dierendonck, M. 2002. "Status and action plan for the Przewalski's Horse ("Equus ferus przewalski")". In: P.D. Moehlman (ed.) "Equids: Zebras, Asses and Horses. Status Survey and Conservation Action Plan", pp. 82–92. IUCN/SSC Equid Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK. 
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