One of the four remaining northern white rhinos dies

A northern white rhinoceros, one of just four left on Earth, died on Sunday at the San Diego Zoo Safari Park after suffering from a bacterial infection and age-related health issues, zoo officials said.

Nola, a 41-year-old rhino brought to the Southern California park in 1989 as part of a breeding program, took a turn for the worse over the weekend following a November 13 surgical procedure to drain a large pelvic abscess identified as the infection source, the zoo said in a statement.

  The 4,000-pound (1,800kg) rhino had been placed under constant veterinary watch last week as her appetite and activity levels declined. After her condition deteriorated significantly, caretakers decided to euthanize the animal, zoo officials said Nola was the only member of her kind left in captivity in the Western Hemisphere. With her death, just three others remain, all at the Ol Pejeta Conservancy in Kenya, zoo officials said.

Nola was born in the wild in Sudan and captured at about 2 years of age, according to San Diego Union-Tribune. She arrived in California from a Czech zoo.

Her death came weeks after six southern white rhinos, close cousins of northern whites, were brought to San Diego from South Africa in an effort to bring Nola's kind back from the brink of extinction.