Translation

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

saru written with kanji is .
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
Katakana
Kanji
School Level

Further Reading

Wikipedia: (Monkey)