Male
noun, の adjective
The kanji means male and this also means male. It's used for animals, plants, and the like.
Note that this is often written in katakana, as in オス.
Male animals can be kind of pushy, always trying to push (押す) other animals around, trying to be the alpha and all.
猫の雄に左利きが多いって本当ですか？
Is it true that many male cats are left-handed?
生まれた子犬、みんな雄だったみたい！
Apparently all the puppies that were born were male!
タイワンリスの雄は、カエルのような鳴き声を出して求愛します。
The male golden-backed squirrel courts by making a frog-like croaking sound.