Translation

kujira means "Whale" in English.

kujira is normally written with katakana, as クジラ.
kujira written with hiragana is くじら.
kujira written with kanji is .
This is a jouyou kanji 常用漢字, taught in junior high, chuugakkou 中学校.
Romaji ku ji ra
Hiragana
Katakana
Kanji
School Level

Further Reading

Wikipedia: (Whale)