A bull hippo in Kruger National Park, South Africa, shows off his enormous teeth to a herd of buffalo.

"Big male hippos are one of the most dangerous animals on the African continent and extremely territorial in behaviour," said the filmer. "Dominant bulls typically display their status through wide-mouth yawns that exhibit their formidable canine teeth. These are instruments of defence, not feeding."

However, the buffalo apparently appeared a little bored by the spectacle and continued to drink water.

While on safari in the Kruger National Park we came across a large herd of buffalo making their way to a watering hole. We arrived at the watering hole where we stopped to watch all the action with the buffalo arriving. Inside the water was a number of crocodiles and one large dominant male hippo. The buffalo herd came down and gathered all around the relatively small body of water. It was not long before the hippo became agitated with the presence of all the buffalo around his permanent residence. Big male hippos are one of the most dangerous animals on the African continent and extremely territorial in behaviour. Dominant bulls typically display their status through wide-mouth yawns that exhibit their formidable canine teeth. These are instruments of defence, not feeding. The lower canines are modified into large tusks that continuously grows. This hippo showed off his teeth several times to all the buffalo, sending the message that he was the dominant one and in charge of that water. The video shows a few buffalo actually lifting their heads to look at the spectacle. With a few buffaloes staring at the hippo it was fascinating to see that majority of the buffalo looked like they couldn’t be too bothered with the performance of the grumpy hippo and continued drinking water. In the end the message was clear and the buffalo did not enter the water further. They finished their drink and left, with the hippo happily going back to rest in his water.