In a zoo in the US state of Texas, mysterious incidents have been increasing for several weeks. Two monkeys have been missing since Monday, the Dallas Zoo announced on Twitter. The two emperor tamarins were not in their enclosure in the morning, it was said. It is clear that the enclosure was “deliberately” damaged.

Normally, the monkeys with curved whiskers would not move far from their home – but a search on the zoo grounds was unsuccessful. According to initial police investigations, there is reason to believe that the animals were stolen.

According to the zoo, it houses more than 2000 animals and more than 400 different species. It is not the first incident this year that caused a stir: a clouded leopard broke out of its enclosure in mid-January, as reported by the Dallas Morning News newspaper. After hours of searching with drones and a special police unit, the big cat appeared unharmed on the zoo grounds. Suspicious damage was also discovered in their enclosure. The police have launched an investigation.

About a week later, a vulture was found dead in its enclosure, the newspaper reported. An autopsy revealed a wound, zoo officials said at a press conference on Monday. A spokeswoman for the zoo previously said the vulture appeared to have died “not of natural causes.” No further details were given. The security measures have initially been strengthened with cameras and night patrols, the zoo said in a tweet.

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