When catsharks glow, they become easier to see, the deeper they swim. And all of that glowing might help the sharks recognize each other.
The elusive species has only been spotted 50 to 60 times since its discovery in 1976.
The soft, seagoing slugs took center stage in a recent underwater photography contest.
Another animal may have succumbed to selfie culture.
Visitors to a giant aquarium in Seoul on Friday were presented with the gory aftermath of a territorial dispute between two sharks.
Winning images capture rarely seen marine life behavior, close-ups of shy creatures and dreamy ocean scenes.
The rare shark has taken up residence near the bustling shore waters of Long Island's Great South Bay.
Sleek and able to camouflage itself when hunting, the animal earns its cool name.
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