India's only gorilla is lonely. Even though Polo is 6 feet tall, dark-haired, bilingual and good-natured, the 36-year-old silverback gorilla is still single after a fruitless eight-year search.

"We have written to all major zoos in the world. We have tried everything," said Vijay Ranjan Singh, the director of the zoo in Mysore, a city in southern India about 525 miles southeast of Mumbai.

Polo, who was sent to Mysore from Ireland's Dublin Zoo in 1995, has been alone since 2000 when his mate, 46-year-old Sumathi, died.