First he made a little hollow in the pond-bottom, and lined it with watergrass and tiny pieces of roots. Next, he made the side-walls of the same things, and last of all, the roof. When it was done, he swam carefully into it and looked around. Under and beside and over him were soft grasses and roots. At each end was an open doorway. "It is a good nest," he said, "a very good nest for my first one. Now I must ask some of my friends to lay eggs in it for me."