In the clip, Jonathan holds the fruit aloft and Tank opens his enormous mouth in anticipation. Jonathan lobs it in and Tank obligingly obliterates it in one bite, the blue jello gushing out as the delighted couple jump with glee as they discover they are having a boy.
With their massive canines, surprising top speed of 30kmph, and unpredictable and aggressive behavior, wild hippopotamus are among the deadliest mammals in the world and kill hundreds of humans every year.
As Hick pointed out, if Tank didn't want to participate in the gender reveal, he simply wouldn't have.
"You can't make a hippo do anything. He weighs 4,000 pounds," he said. "He enjoyed it as much as anybody else did."
Indeed TV producer Ana Breton, who helped the video go viral on Twitter when she described it as "the worst gender reveal", said she subsequently got in touch with the expectant mother who assured her all was well.
"For anyone that is concerned for the hippos and his well-being, he has been hand raised by his amazing owner, who assisted us in feeding him the only food that is safe for him to consume... organic Jell-O inside the watermelon... and yes, Tank was more than happy to have the treat," she said. "He walked right to us and opened his mouth."