Subscribe | UPI Odd Newsletter Subscribe May 30 (UPI) -- A couple filming turtles sunbathing on a "rock" in a South African national park said they were surprised when the "rock" turned out to be hippopotamus. A woman on safari with her husband May 3 in Kruger National Park captured video of a group of about 20 turtles sunbathing on what appeared to be a "rock" in a body of water. Advertisement The woman said they were shocked to discover the turtles were actually climbing on the back of a swimming hippo. "At first we saw a bunch of turtles, which were quite funny, basking in the sun and swimming to what we thought was a rock. Then a hippo took out its head from the water and made us laugh because neither me nor my husband expected to see a hippo with 20 turtles on his back," the woman wrote. Read More Annoyed hippo charges tourists at South African park Territorial hippo charges car on South African road Premature baby hippo takes her first bath at Ohio zoo