Two emperor tamarin monkeys at the Dallas Zoo went missing Monday and officials say they found evidence that their habitat was "intentionally compromised."
According to KRLD's media partner NBC 5, the zoo notified Dallas police, who were already involved due to a string of unusual incidents at the zoo.
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The missing monkeys mark the fourth suspicious incident at the zoo this month. First, a clouded leopard escaped from its habitat after the enclosure was intentionally cut on Jan. 13. Authorities then found a similar cut at the habitat housing langur monkeys.
Finally, a 35-year-old lappet-faced vulture was found dead with an "unusual wound" on Jan. 23, the zoo said.