Two children put up a birdhouse in their backyard and watch as a pair of tree swallows build a nest and raise six babies before migrating south in the fall. Includes information about tree swallows and about birdhouses.
Two children put up a birdhouse in their backyard and watch as a pair of tree swallows build a nest and raise six babies before migrating south in the fall. Includes information about tree swallows and about birdhouses.
