His efforts are one of the most well - documented breeding efforts ever recorded. (bil-jac.com)
Through selective breeding efforts, guinea pigs are found in an array of colors and coat types from which to choose. (vin.com)
Efforts led by the State of Wyoming and the U.S. Fish & Wildlife Service that brought in teams of experts in a wide diversity of fields, saved the black - footed ferret from extinction through successful breeding efforts in specialized facilities, including zoos. (reviverestore.org)