0 a creature with feathers and wings, usually able to fly -- 鸟;禽
1 a particular type of person -- 某类人;家伙
In September, these birds migrate 2,000 miles south to a warmer climate.
The noise of the car startled the birds and the whole flock flew up into the air.
Cuckoos are famous for laying their eggs in the nests of other birds.