WATCH: Heart-melting moment father and daughter gorillas are stumped by caterpillar

THIS is the adorable moment a pair of gorillas are totally stumped by a caterpillar as it wriggles up their cage.

The huge silverback Kakinga, who weighs a whopping 419-pounds, was left bamboozled by the tiny insect in his enclosure at Calgary Zoo, in Canada.

His daughter Yewande can’t take her eyes off the peculiar creature as it crawls up the gridded cage.

   TUNNED: This gorilla is let stunned by a humble caterpillar

Pack leader Kakinga then bounds into the shot and sweeps his daughter aside as he investigates the mysterious creature.

But the 37-year-old beast is soon put under a spell by the creepy crawly as it walks along the enclosure.

    BAFFLED: The pair can't quite work out what is going on

The silverback keeps his daughter away as she clambers all over her father to try and get a peek once more.

The pair turn suspicious as the caterpillar goes back and fourth on the metal bar.

It seems the gorilla just cannot work out what is going on.

DAD: Kakinga is described as a good dad as he and his daughter investigate the caterpillar

The wary pair eventually decide to leave the creature alone.

A zoo spokesperson said: “The baby gorilla is just like any baby should be.

“She is mischievous and wasn't happy with one piece of apple or a grape - she wanted the entire bucket.

    INSECT: The caterpillar can be seen wriggling up and down the cage

“A few times Kakinga had to put her in her place, but he was gentle about it.

“You could see he's a good dad.”

The video was shot in 2012 but has only just gone viral and has attracted almost 400,000 views on YouTube.