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Five unexpected passengers were found on the 15,550-teu Eugen Maersk (built 2008) before it arrived in Rotterdam port yesterday.
Wild crab-eating macaques monkeys were running wild on the ship and they were eventually caught by crew members and put in a cage where they were offered food.
According to the Copenhagen Zoo, the stowaways likely include two males, two females and one youngster.
The primates are thought to have climbed aboard the ship in Malaysia.
Invasive species by nature, the monkeys will either be sent back or given to a Dutch zoo.
That is not the first time that a monkey has been found on a Maersk ship.
Back in 2011, a monkey was found on the 8,160-teu Skagen Maersk (built 1999) after it had called in Malaysia.