A moorhen is a water bird. It is mostly dark, almost black, with a bright red and yellow bill, and it lives by lakes, ponds, and slow rivers, walking in the reeds or swimming with a little jerk of the head. In spite of the name, it is not a farm hen, and you will not usually find it on a moor (the open, wet high land). The name is old and a bit mixed-up; the bird just kept it. You see moorhens in parks as well as in the countryside. They are common in many countries, including Taiwan.