Otter FossilsScientists have unearthed fossils of an otter that lived in rivers and lakes in a warm and humid wetland region in south western China about 6.2 million years ago . Otters are usually not much bigger than a medium-sized dog . Yet the body size of the latest discovery is almost approaching (1 ...........) of a wolf . This outsized otter , called Siamogale melilutra , it's bigger than any of its cousins ​​alive today . weighed about 50kg and measured up to two meters long, (2............) Siamogale melilutra reminds us of the diversity of life in the past and how many more questions (3............) could still be to answer , said one of the scientists involved. (4.............) would ever have imagined a wolf - sized could otter ? The otter ate large shellfish , using its strong jaws to break the shells . This seems somewhat (5.............) the eating habits of modern sea otters , although the latter use stone tools to smash the shells .​