bird是可數名詞還是不可數名詞?

The bird disappeared into the scrub.

鳥消失在矮樹叢中。

The bird flapped its wings furiously.

那隻鳥使勁地拍打着翅膀。

There was a bird perched on the roof.

有一隻鳥落在屋頂上。

A bird had pecked a hole in the sack.

一隻鳥把袋子啄了個洞。

The bird fanned out its tail feathers.

這隻鳥把尾羽展成扇形。

The bird caught the insects in mid-air.

鳥在半空中捕捉了昆蟲。