This is the moment an incredibly cute baby gorilla appeared to collapse in a fit of giggles when an adult started ticking his tummy.
Five-month-old Jengo was being showered with affection by the other gorillas in his enclosure at Leipzig zoo in eastern Germany when one of them reached out and gently prodded him on the ribs.
Displaying an almost human response to the sensation, Jengo's eyes lit up with joy and his mouth broke into a huge grin as the adult gorilla played with him.

Despite his tiny frame, Jengo is not the youngest gorilla in the enclosure after he was joined by a sister named Diara...