According to German and Scandinavian folklore these were fairy creatures that lived in forests. Sometimes when in need they would borrow food and other things from people, but they always paid back many times in return. Occasionally when their infants were sick they asked to barrow breast milk; although they infrequently did this because of fear and superstition the local mothers viewed them with apprehension. A.G.H.
Source: 62, 184.