Experts warn that the weight gain is contributing to infertility, which could be detrimental to the survival of the species in zoos.
Two surviving cubs from May 27 birth finally get their pictures in the media.
Unfortunate keeper hospitalized for three days after drill went awry.
Madrid Zoo welcomes the latest addition to the Rothschild giraffe club.
Baby western lowland gorillas make their debut.
The Buenos Aires Zoo recently presented white Bengal tiger triplets, just three months old, to the viewing public for the first time.
Valium might seem to be an unusual drug to give to whales in captivity, but its use on marine mammals at aquariums and rescue facilities is probably more common than you might think.
The National Zoo's 7-month-old panda cub, Bao Bao, makes her first trip outside with mother Mei Xiang.
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