By Graeme Green Twenty-one critically endangered black rhinos have been safely delivered to Loisaba Conservancy in northern Kenya from other parts of the country, part of a wider mission to secure the long-term future of the species in Kenya. “It’s been a massive operation,” says Tom Silvester, CEO of Loisaba Conservancy, who oversaw the process. “It’s incredible to see black rhinos back in Loisaba after an absence of 50 years.” Wildlife translocations are usually driven by a need to create new breeding strongholds and return native species to locations where they’ve gone locally extinct. But …