Five bundles of tiger joy

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Five rare tiger cubs have been born at the Saint Louis Zoo, the Associated Press reports.

The zoo says the critically endangered Amur tigers were born April 28 and are in an off-display indoor den.

The first-time mother, Kalista, is busy nursing and caring for her babies, the zoo says.

The normal litter size is two or three cubs. The five weigh 4.5 to 7 pounds each.

The species used to be called Siberian tigers. They are at risk because of habitat loss, human encroachment and poaching, zoo officials said.

-- Francisco Vara-Orta