MIDAlpha TitleTitleYearColor/BWRunning TimeFormatsAbstractTopics
3169WHY DO BIRDS SING?WHY DO BIRDS SING?1976color29 min16mm/vhs (Nova series) Scientists have found that while some knowledge of birdsong is hereditary, fledgling birds must be taught by their adults how to sing properly. By isolating birds and selectively teaching or not teaching the adult birdsongs to fledglings, scientists hope to discover how birds learn to sing and, consequently, how humans learn to speak.