What do you believe is the single most important factor driving up the cost of living in Nigeria?

More than a dozen tigers were incinerated after the animals contracted bird flu at a zoo in southern Vietnam, officials said.

State media VNExpress cited a caretaker at Vuon Xoai zoo in Bien Hoa city saying the animals were fed with raw chicken bought from nearby farms. The panther and 20 tigers, including several cubs, weighed between 10 and 120 kilograms (20 and 265 pounds) when they died. The bodies were incinerated and buried on the premises.

"The tigers died so fast. They looked weak, refused to eat and died after two days of falling sick," said zoo manager Nguyen Ba Phuc.

Samples taken from the tigers tested positive for H5N1, the virus that causes bird flu.

The virus was first identified in 1959 and grew into a widespread and highly lethal menace to migratory birds and domesticated poultry. It has since evolved, and in recent years H5N1 was detected in a growing number of animals ranging from dogs and cats to sea lions and polar bears.

• Read More