But they have left many of them so overweight they can hardly get around.

DON'T 'ave a banana: Macaca mulatta monkeys at Ohama park in Japan are grossly overweight

This chunky monkey is among about 50 that have alarmed the park's overseers

About 50 Macaca mulatta monkeys at Ohama park in Sakai, Osaka Prefecture have been left massively overweight after being overfed by tourists.

A local report in April said that about 30 per cent of the animals are so huge they struggle to get around their 420-square-meter enclosure.

Officials have been forced to put them on a strict diet.

A healthy Macaca mulatta monkey weighs in at about 20lbs, but one of these chunkies is over 4st.

The monkeys usually weigh around 20lbs, but one at the park is a whopping 4 1/2 stone

Don't feed the animals: Visitors to the park are being asked not to throw bananas to the obese monkeys