A Duolingo screenshot with the sentence "Cats purr when they're happy" translated into Japanese.
https://d1olbeymy2bhfb.cloudfront.net/media_attachments/files/109/788/411/959/175/638/original/5673492986a72042.jpg
I love all these onomatopoeia in Japanese (there's loads of them). ごろごろ (goro) is nice and means different things, apart from purring it means rumbling (like thunder) and also "lazing about" .
In this example, it literally translates as "cats say goro when they're happy" ?
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