白鳥

In a sentence

• 庭に白鳥が一羽いました。

  There was one swan in the garden.

  Here, '白鳥' refers to the animal, the swan, described as being present in the garden.

• 湖の白鳥たちは一日のほとんどを泳ぎながら過ごします。

  The swans in the lake spend most of their day swimming.

  In this sentence, '白鳥' is used to refer collectively to swans inhabiting the lake, indicating their habitual activity.

• 白鳥が静かな湖面で羽を広げています。

  The swan is spreading its wings on the calm lake surface.

  Here, '白鳥' explicitly describes the individual swan as it performs an action on the surface of the lake.