Glow-in-the-Dark Animals May Have Been Around for 540 Million Years
Ancestors of so-called “soft” corals may have developed bioluminescence in the earliest days of deep-ocean living
![Glow-in-the-Dark Animals May Have Been Around for 540 Million Years](https://static.scientificamerican.com/dam/m/81e4d1803bcd0af/original/C1-aug10-hires-lead.jpg?w=1200)
Ancestors of so-called “soft” corals may have developed bioluminescence in the earliest days of deep-ocean living
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