They are shortened and condensed from the original recordings made by MIST Software in order to make them more manageable over the internet. Remember, some birdsongs go on for a long time. The Mockingbird often sings for extended periods, and the Red-eyed Vireo seems to sing constantly while feeding in the treetops. And these nocturnal birds seem to choose singing spots near the windows of sleeping humans. But before long, he or she begins to wonder if the bird has an 'off' switch.
Some birds make many different calls.
Following the list of birds is a list of general habitat types and the birds from this guide often found in the various habitat types. Remember, many birds may be seen in a variety of habitats. It's wild, ringing calls are often regarded as the voice of the north woods. Loons are found on wooded lakes and rivers in Canada and northern United States in the summer and in the ocean as far south as the gulf coast in winter. Loons feed by catching fish under water.