4-month-old Indian rhino Ethan unexpectedly at Montgomery Zoo MONTGOMERY, Ala., Oct. 21 (UPI) -- Ethan, the first Indian rhinoceros to be born in the United States as a result of artificial insemination, died unexpectedly at the Montgomery Zoo in Alabama. The 4-month-old rhino died Friday of unknown causes, the Montgomery Advertiser reported. Sarah McKemey, a public relations director for the zoo, said a necropsy will be performed to determine Ethan's cause of death. "It is a shock and a loss to us for it to be so sudden and unexpected," McKemey said. Indian rhinos are an endangered species; Ethan's birth, which was achieved by staff at the Montgomery Zoo impregnating female Jeta with sperm from Himal, a male rhino, was seen as a sign artificial insemination may help sustain the remaining population.