This pumped-up primate looks like it has been doing some serious pull-ups on the monkey bars.
Santeri Oksanen, 34, snapped the muscular monkey as she kept a close eye on her territory.
The game developer, from Lauttasaari, Finland, captured the White-Faced Saki’s grumpy expressions while visiting Korkeasaari Zoo in his country’s capital, Helsinki.
He said: “I couldn’t believe the huge muscles that the monkey had.
“The other monkeys were very small in comparison, they all looked a bit scared of her.
“The pictures make it look like it’s competing in a body building contest.”
This species of monkey live almost entirely in trees and seldom come to the ground – meaning they must have strong muscles to move around.
The burly beast is native to South America and Santeri believed she might be one of the dominating mothers of the troop.
The male and female White-Headed Sakis are identified by the colour of their faces – a male would have a white face while a female would have a brown-grey coloured complexion.