The water deer is a small deer more similar to a musk deer than a true deer. They are native to China and Korea. Its prominent tusks have led to it being colloquially named the vampire deer in English-speaking areas to which it has been imported. Even though it lacks antlers and certain other anomalies—including a pair of prominent tusks(downward-pointing canine teeth) it is still classed as a deer.
They inhabit the land alongside rivers, where they are protected from sight by the tall reeds and rushes. They are also seen on mountains, swamps, grasslands and even open cultivated fields. Water deer are proficient swimmers, and can swim several miles to reach remote river islands
These canines are held loosely in their sockets, with their movement controlled by facial muscles. The buck can draw them backwards out of the way when eating. In aggressive encounters, he thrusts his canines out and draws in his lower lip to pull his teeth closer together. He then presents an impressive two-pronged weapon to rival males.