Nevada Bighorns Unlimited | Sportsmen working for the future of Nevada’s wildlife Nevada Bighorns Unlimited After the almost total extinction of bighorn sheep in the state once our most numerous big game animal NBU has been instrumental in the reintroduction of all three species of bighorn into more than 60 mountain ranges throughout Nevada. Sportsmen Working for the Future of Nevadas Wildlife Nevada Bighorns Unlimited NBU is a nonprofit 501c3 grass roots sportsmens conservation organization with over 3500 members throughout Nevada the western United States and North America. The mission of the organization is to protect and enhance Nevadas wildlife resources for sportsmen outdoor and wildlife enthusiasts for this and future generations. NBU volunteers do this through the reintroduction of big game habitat conservation and improvement public education and participation biological and scientific research and the influence of public policy.