Standing upright behind ranger Mathieu Shamavu, the gorillas served nothing but face for the camera.
"Those gorilla gals are always acting cheeky so this was the ideal shot of their true personalities!" the post continued.
A park official said the gorillas appeared to be imitating their caregivers, who had raised them.
Virunga National Park confirmed in a Facebook post on Monday that the photo is real, saying, "Those gorilla gals are always acting cheeky so this was the ideal shot of their true personalities!"
But these two gorillas prove anyone can do it, with a little attitude.
In posting the selfie, Virunga National Park noted that the pair of gorillas live in an enclosed sanctuary where caretakers have worked to avoid putting their health in danger. While gorillas can be risky to humans and have be known to kill, a strong bond has formed between the critically endangered primates and the Virgunga park rangers.
In a Facebook post, the park said it had received lots of messages about the selfie.
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All of the rangers go through an extensive six-month training regime to become guardians of the park.
"These are exceptional circumstances in which the photo was taken".
According to their website, Virunga is Africa's oldest national park.
Several rangers have been killed there, and two Britons were kidnapped on the site previous year. In addition to mountain gorillas, the Park is also home to a number of different primates, elephants, lions and 706 different species of birds.
Many wondered if the photo was real and the park clarified how the gorillas were much at ease in presence of humans.
However, the work at the park is not all fun and games.