猿が

a monkey

→ 猿
phrase Uncommon #19,041
a monkey 猿 means “monkey,” and が marks it as the subject of the sentence. The word 猿 is also commonly written サル.
JA: 猿が木の上で昼寝をしている。
EN: A monkey is taking a nap in the tree.

猿が木に登るのは簡単だ

It's easy for monkeys to climb trees.

ああ猿がいなければどうすればいいのかわかりません

Ah, if there are no monkeys, I don't know what to do.

— ウィキッド 永遠の約束 (2025)

猿がその森にたくさんいる

There are lots of monkeys in that forest.

洞窟から大きな猿が現れる彼らはびっくりして逃げていった

When a large ape emerged from the cave, they were startled and ran away.