A group of over 100 baboons at a Dutch zoo suddenly started acting strangely. Normally, the baboons are very active and entertaining for visitors but have suddenly become very sullen, sitting with their backs to onlookers. There are claims the baboons may have seen a UFO.

The mysterious behavior has zookeepers at the park baffled. They say the baboons have even lost their appetite. While a UFO spotting is one of the more popular theories, zookeepers say some other environmental event like an earthquake or an unseen predator, either real or imagined, is a more plausible explanation. They say this behavior is rare, but admit this isn't the first time the baboons have acted strangely.

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