具体描述
One day, Hayley and Martin decide to build a birdhouse to attract backyard swallows. Soon, their new home is in use, and the children can watch as the swallows collect nesting materials and lay six snowy white eggs. The male must protect the nesting female, and both parents must perpare to feed their young plenty of tasty bugs. Before long, Hayley and Martin can see six little brown birds accompanying their parents outside the birdhouse and preparing for their long trek to warmer winter weather. The children have built a successful box, but will their swallow family return next year?
