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@xconde No, the example renders the words "dolphins" without kanji, using the phonetic hiragana characters いるか (i + ru + ka). This may be in order to help Japanese learners like me, or to help native Japanese readers who may not be familiar with the reading of 海豚.

What is a bit odd is that the hiragana alphabet is used, and not the katakana alphabet, which is more commonly used for animal names. That spelling would be イルカ (also the sounds i + ru + ka, but in a different alphabet).