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 鯨.
This is a jouyou kanji 常用漢字, taught in junior high, chuugakkou 中学校.
Romaji ku ji ra
Hiraganaくじら
Katakanaクジラ
Kanji 鯨
School Level 中

Further Reading

Wikipedia: 鯨 (Whale)