The green vervet monkeys orriginally arrived is St Kitts when the French occupied the island sporadically in the time frames of 1665 to 1690.
They brought them as pets. Eventually the French were deported and the monkeys were not allowed to enter the boats so they were abandoned on the island.
This did not pose a threat for them because St Kitts had ideal climate and vegitation with no enemies. They began to multiply and to date they have out-populated humans on the island. There are 1.25 monkeys for every human. The current population of monkeys on St Kitts is about 53,000.
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