Good bird sounds, but book badly needs an index. There are numbers to press to hear a bird song, but one has to find the page on which the particular bird is discussed to find the "song" reference number. To make things worse, the birds are not arranged alphabetically, but by type of area in which they are found - water, forest, etc. -- which don't correspond to geographic areas. With a few hours effort on the computer, I made a proper alphabetical index with page number and song numbers, that was sorted by song and by page.
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