Translation of "Hippos" in Japanese

Hippos keep cool in water during the heat of the day,

‎カバは日中は水中で ‎体を冷やし‎―

In the evening I went out on safari again, at night I fell asleep hearing the grunting of the hippos.

夕方にまたサファリに出掛け、夜はカバの声を聞きながら眠りについた。