This is the shocking moment wild monkeys stole food from the back of a passing pickup truck in Thailand.

The gang of macaque thieves swiftly onto the back of vehicle as it slowed down on a busy road in Prachuap Khiri Khan.

Footage shows the primates helping themselves to packaged bread and vegetables, such as string beans, while the family watched from the other side of the truck window on September 29.

One of the animals seized an entire loaf of bread and scurried back to its troop, leaving the truck owners stunned.

Thailand's growing population of primates has become a problem as the animals are known to damage property, such as cars and buildings. Unafraid of the consequences, they have also started stealing food from tourists and locals.

The Thai government is taking steps to manage the monkey population in the country, including creating sanctuaries, mass sterilisation programs, educating the public on how to handle the animals properly, and relocating them to more suitable habitats.