《山海经·山经·北山经》
水中还生长着很多水马，外形与一般的马相似，但前腿上长有花纹，并拖着一条牛尾巴，发出的声音像人呼喊。
其中多水马，其状如马，文臂牛尾，其音如呼。
There are also many water horses in the water, which are shaped like ordinary horses, but have textured forelegs and a cow tail. They make sounds like human shouts.