History of animal testing of visual areas in cats and monkeys, and provided physiological evidence for the critical period for the development of disparity sensitivity in vision (i.e.: the main cue for depth perception), and were awarded a Nobel Prize for their work. In 1996 Dolly the sheep was born, the first mammal to be cloned from an adult cell. The process by which Dolly the sheep was cloned utilized a process known as nuclear transfer applied by lead scientist Ian Wilmut. Although other scientists were not immediately able to replicate the experiment, Wilmut argued that the experiment was indeed repeatable, given a timeframe
The Marine Mammal Center no longer capable of fending for itself. Some animals may have suffered injuries that have left them blind or otherwise disabled. Although their health is stable, they may no longer be able to survive independently in the wild. These too, are considered unreleasable. In these circumstances, the Marine Mammal Center works with the National Oceanic and Atmospheric Administration (NOAA) and the National Marine Fisheries Service (NMFS) to find a permanent home for the animal in an approved zoo or aquarium. In May, 2011, the San Francisco Zoo accepted two such animals, both are male California sea lions; named Silent Knight