Gorillas are considered to be highly intelligent mammals and one named Koko was able to learn a subset of sign language.
However, one cheeky gorilla showed off a form of its own sign language at a wildlife park by appearing to give the middle finger.
Captured at Busch Gardens in Tampa, Florida, US, the large silverback gorilla can be seen interacting with an older blackback.
Picking up a toy, the blackback throws it at the silverback who protects itself by lifting a hand to its face.
Continuing to annoy the silverback, the blackback reached over and picked up the toy as if intending to throw it again.
But before he gets the chance, the silverback casually gives it the middle finger.
Silverback gorillas are generally more than 12-years-old, and feature a distinctive patch of silver hair on their backs.
These gorillas have large canine teeth, and have the ability to laugh, grieve, make and use tools and develop loving bonds with their families.