One question, briefly and comfortably answered: why do birds sing? Specific birds (robin, cardinal, etc.) are observed as they sing to establish territory, give an alarm, call their young to dinner, and attract a mate. The pictures are innocuously just there, neither offensive nor particularly attractive or useful. Like Miss Gans' other bird books in the series, this provides little information quantitatively but offers a start in the right direction -- especially if new readers heed her closing suggestion to ""Watch the birds and listen to them. See if you can find out what 'bird talk' is all about.