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."
Before doing this, he went to look at the homes built by his neighbors. After he left the company in the quiet pool, many others did the same, until the only Sticklebacks left there were the dull-colored ones, the egg-layers. The nest-builders had been dull-colored, too, but in the spring-time there came beautiful red and blue markings on their bodies, until now they were very handsome fellows. It is sad to tell, still it is true, that they also became very cross at this time. Perhaps it was the work and worry of nest-building that made them so, yet, whatever it was, every bright-colored Stickleback wanted to fight every other bright-colored Stickleback. That was how it happened that, when this one went to look at the nest of an old friend, with whom he had played ever since he was hatched, this same friend called out, "Don't you come near my nest!"
THEN THEY SWAM AT EACH OTHER.
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The visiting Stickleback replied, "I shall if I want to!" Then they swam at each other and flopped and splashed and pushed and jabbed until both were very tired and sore, and each was glad to stay by his own home. This was the time when they wanted to look fierce.
Soon the dull-colored Sticklebacks came swimming past, waving their tails gracefully, and talking to each other. Now this fine fellow, who had sent the Snails away and built his nest, who had fought his old friend and come home again, swam up to a dull-colored Stickleback, and said, "Won't you lay a few eggs in my nest? I'm sure you will find it comfortable."
She answered, "Why, yes! I wouldn't mind laying a few there." And she tried to look as though she had not expected the invitation. While she was carefully laying the eggs in the nest, he stood ready to fight anybody who disturbed her. She came out after a while and swam away. Before she went, she said, "Aren't you ashamed to fight so? We dull-colored ones never fight." She held her fins very stiff as she spoke, because she thought it her duty to scold him. The dull-colored Sticklebacks often did this. They thought that they were a little better than the others; so they swam around together and talked about things, and sometimes forgot how hard it was to be the nest-builder and stay at home and work. Then they called upon the bright-colored Sticklebacks, for they really liked them very much, and told them what they should do. That was why this one said, "We dull-colored ones never fight."
"Have you ever been red and blue?" asked the nest-builder.
"N—no," said she. "But I don't see what difference that makes."