Many people just found out that flashlight fish exist, thanks to the viral tweet below. The glowing fish have lights under their eyes that blink on and off. But it turns out that there’s even more ...

Hundreds, if not thousands, of small flashlight fish—glowing blue—began emerging from the underwater cave. They streamed over the reef “like a carpet of lights,” says Phillips. Their illumination was ...

Flashlight fish have the ability to generate situation-specific blink patterns resembling a visual Morse code. Researchers have shown in laboratory and field experiments that the animals use these ...