Rams have been observed in head to head combat for as long as 24 hours. A desert subspecies (Ovis Canadensis nelsoni) is found from Nevada and California to west Texas and south into Mexico. Bighorns have a complex 9-stage digestive process that allows them to maximize removal of nutrients from food of marginal quality. Scientific specimens collected and sent to a lab clearly indicated that significant numbers of lambs are lost as a result of the pneumonia/lungworm complex.