sea turtle
Refers to any marine turtle. In everyday Japanese, ウミガメ is the most common form.
A sea turtle came to the sandy beach to lay eggs.
You can see sea turtles at this aquarium.
The most common spelling; usually written in kana.
Kanji spelling, used especially in formal or scientific contexts.
Mixed kanji-katakana spelling; rarely used.
Mixed kanji-kana spelling, less common than ウミガメ or 海亀.
Compound of 海 (umi, 'sea') and 亀 (kame, 'turtle'). The kana spelling ウミガメ is standard in modern usage.