Little White Horse
A Lithuanian tale, this version is taken from the 1938 anthology Wonder Tales from Baltic Wizards by Frances Jenkins Olcott.
There was once a man who had three sons, two were clever, but the youngest was simple. The Father bought each of them two horses.
One day they heard that something was eating up their barley. The first night, the Father sent the eldest son to the field to watch the barley. But he fell asleep and saw nothing.
And the next day, when he came home and his Father asked, “Now what have you seen?” he said, “Nothing.”