For the first time, researchers have recorded penguins making sounds during their deep-sea dives. The findings were described in a recent study published in the journal PeerJ. The findings could clue scientists in to the communicative cues penguins rely on to hunt. Which sentence could be added to the passage to maintain its formal style? I think penguins should be left alone. Scientists can now study the sounds to learn more about penguins. It would be awesome to hear a penguin talk underwater. The scientists can translate the sounds so humans can understand them.