7 Animal Friendships: Best Animal Friends

KOKO

**FILE** Koko, the 230-pound gorilla who converses in sign language, admires her new kitten in this April 2, 1985 file photo. Koko received a clean bill of health after a full medical examination, Saturday, Aug. 7, 2004. (AP Photo/Ronald Cohn, National Geographic Society/File) Original Filename: KOKO_HEALTH_NY132.jpg