1. The birds line up on the boughs of a pignut hickory, and swoop on to the feeders by twos and threes, titmice and juncos, a crowd of chickadees and a demure pair of cardinals. 鸟儿排成行，立在山核桃树的枝桠上，三三两两地俯冲而下捕食，有大山雀、灯芯草雀，还有一群美国山雀和一对含羞的红衣风头鸟。