Twiga (born 1996 at Rhenen Zoo) is a purebred Rothschild's giraffe; as are all her offspring as Mukulu was a purebred Rothschild's giraffe. Her parents were Nico (born 1981 at the Arnhem Zoo) and Eepie (born 1989 at the Rhenen Zoo). Nakuru (born 2012 at Auckland Zoo) is a hybrid. While her father, Zabulu (born 1998 at Orana Wildlife Park) was a purebred Rothschild's giraffe; her mother, Rukiya (born 2001 at Wellington Zoo) was a hybrid. Rukiya's parents, Ricky (born 1987 at Taronga Zoo) and Tisa (born 1990 at Melbourne Zoo) were closely related and descend from a long line of Taronga bred giraffes, founded by several purebred wild caught giraffes of different subspecies, who subsequently bred/inbred to produce a melting point of hybrids. Auckland Zoo's previous breeding females, Kiri (1984-2003) and Kay (1986-2007) descended from the Taronga stock (paternal line) and were hybrids, therefore their offspring with Zabulu were also hybrids. It's a shame Zabulu was never found unrelated purebred Rothschild's females to breed with.