When the Sand-Hill Cranes were married, they began to work for a home of their own. To be sure, they had chosen a place for it beforehand, yet there were other things to think about, and some of their friends told them it would be very foolish to build on the ground. "There are so many accidents to ground nests," these friends said. "There are Snakes, you know, and Rats, and a great many other people whom you would not want to have look in on your children. Besides, something might fall on it."