摘要
20世纪70年代,北美洲大约有100亿只鸟。现在则约有70亿只,意味着这个大陆失去了超过四分之一的鸟类。在失去的30亿只鸟中,有90%属于12个鸟类科别,全是不同种类的鸣禽——即雀形目鸟类的一个广泛亚目,从色彩缤纷、叫动听的丽色彩,到又大又黑、叫声粗糙的普通乌鸦均属之。
In 1970,there were approximately 1obillion birds in NorthAmerica.Now,there are around 7 billion,representing a loss of over a quarter of the continent's birds.Of the 3 billion birds lost,9o%come from just 12 families,all various types of songbirds:a broad suborder of perching birds,including everything from painted buntings,dainty and colorful with a melodic whistle,to the common crow,large and black with a scratchy caw.
