noun
male bird
Only when written 雄鳥
General term for any male bird; Restricted this sense to the kanji 雄鳥, but kana spelling is common.
See also: 雌鳥
この森には雄鳥がたくさんいる。
There are many male birds in this forest.
Specifically a male chicken; 雄鶏 is especially appropriate for this sense.
See also: 雌鶏
朝、雄鶏が鳴いた。
The rooster crowed in the morning.
Both senses are usually written in kana; this is the most common practical spelling.
Compound of 雄 (おん, 'male') + 鳥 (とり, 'bird'), with rendaku voicing of とり to どり. The kanji 鶏 specifically means 'chicken'.