Translation

saru means "Monkey" or "Primate" in English.

saru written with kanji is 猿.
This is a jouyou kanji 常用漢字, taught in junior high, chuugakkou 中学校.
saru written with katakana is サル.
saru written with hiragana is さる.
Romaji sa ru
Hiraganaさる
Katakanaサル
Kanji 猿
School Level 中

Further Reading

Wikipedia: 猿 (Monkey)