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This frog may look small, but he makes a very loud sound - emitting a shriek almost like a deflating balloon.

The hilarious footage shows the non-venomous Cape Rain Frog who alerted Simon van Nierop to his presence when he let out a scream at the family dogs.

Simon was out walking in Tokai Forest, Cape Town, with his family.

The 42-year-old heard the frog before he saw it after it started screaming when it was uncovered by Lulu and Bella.

Simon, an amateur photographer and owns his own flooring business, says stumbling across the frog was pure accident.

(Image: Simon van Nierop/Caters News)

“We were just taking our dogs for a walk in the lower forest when we saw, or Arthur heard, the frog.

“A lady was walking on the path and said, “ooh frog”, so we took the kids to go look but we weren’t expecting this!

“It was just off the forest path we were walking along. The dogs went beserk.

(Image: Simon van Nierop/Caters News)

"Apparently the frogs burrow underground and come up just before the rain.

“Our Jack Russell, Lulu, kept barking and trying to get up close but then the frog would scream.

“My son Jesse was holding Lulu back, as we were worried she would try kill it.

(Image: Simon van Nierop/Caters News)

“The frog was blown up like that when we found it and didn’t go down either.

“We laughed hysterically and you also feel this sense of weirded out amazement that something that weird exists…and makes that sound.

“All we could think was how absolutely weird this frog is .

(Image: Simon van Nierop/Caters News)

“We have never seen or captured this before and we hope we see one again, it’s just too hysterical.”