AIBO (stylized as aibo, abbreviated as Artificial Intelligence RoBOt, homonymous with aibō (相棒), "pal" or "partner" in Japanese) is a series of robotic dogs designed and manufactured by Sony. Sony announced a prototype Aibo in mid-1998, and the first consumer model was introduced on 11 May 1999. New models were released every year until 2006. Although most models were dogs, other inspirations included lion cubs and space explorers. Only the ERS-7, ERS-110/111 and ERS-1000 versions were explicitly a "robotic dog", but the 210 can also be considered a dog due to its Jack Russell Terrier appearance and face. In 2006, AIBO was added into the Carnegie Mellon University Robot Hall of Fame.