Top ten world's ugliest animals The ugliest animals on earth. Would you like any of them as a pet?. #1 - Mata Turtle#1 - Mata Turtle: More photos The mata mata is a freshwater turtle found in South America, primarily in the Amazon and Orinoco basins. #2 - Frilled Shark#2 - Frilled Shark: More photos Exhibiting several "primitive" features, the frilled shark has often been term..