Fish
Fish are an incredibly diverse group of animals. Read these articles to find out about all kinds of unique and different fish.
The Predatory Snakehead Fish, or 'Frankenfish,' Can 'Walk' on Dry Land
Piranhas: Toothy Nippers With a Bad Reputation
Do Fish Get Thirsty?
Yes, Male Seahorses Do Give Birth! Here's How
Do Fish Sleep?
Hagfish: This Eel-like Slime Machine Is a Predator's Nightmare
10 Biggest Sharks in the World
The Porbeagle Shark Hunts With Dogged Determination
WWII Sparked America's Shark Obsession, Not 'Jaws' or Shark Week
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Sharks: They are the stuff of legend and the stuff of nightmares. But which are the biggest? Here are the top 10.
By Carrie Tatro
Unlike most species on Earth, the male seahorse, rather than the female, does the gestating and delivery. And he does it in his own unique way, a new study found.
It's hard to imagine Nemo catching some z's in the Great Barrier Reef. But fish do need rest. Do they sleep like we do?
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The elusive hagfish is a master at hiding in holes and crevices, but its main defense is its ability to release a noxious, suffocating and sometimes poisonous slime when attacked.
By Mark Mancini
Porbeagles are related to great whites, but while they're also athletic killers, they're smaller and far less ferocious. And what's with the funny dog name?
By Mark Mancini
Decades before Discovery started its wildly successful Shark Week, Americans were transfixed by stories of shark-infested waters.
The showy lionfish is a stunning beauty. But this invasive species, which was released into the wild in the 1980s, is wreaking havoc on delicate reef ecosystems worldwide.
By Wendy Bowman
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The lemon shark isn't as aggressive as some other sharks and it isn't quite as yellow as its name suggests.
By Katie Carman
This denizen of the frigid deep not only lives a crazy long life, it also can grow up to 24 feet in length and eating its flesh can make humans "shark drunk."
By Katie Carman
Most species of the rarely seen anglerfish live up to a mile beneath the ocean, where the females lure prey with a head-dangling hook appendage and permanently fuse with male suitors. It doesn't get much stranger than that.
By Katie Carman
The swordfish's nose might look crazy weird, but these gladiators of the sea are perfectly outfitted for ocean battle.
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The snakehead fish can breathe air, double its population in 15 months and has a huge appetite, which is not a good thing for native species.
Humuhumunukunukuapua'a, the colorful little fish with the craaaaazy long name, is Hawaii's state fish, but it wasn't always.
The basking shark, an endangered species, may look like a fearsome predator, but is actually a filter-feeder, gathering zooplankton and other tiny animals, such as shrimp, in bulk as it roams the seas with a wide open mouth.
By Mark Mancini
Piranhas are some of the most feared fish in the world, but is their reputation for ferocity a bit overblown?
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They're swimming in water all day so how could they ever get thirsty? The answer might surprise you.
A Texas man caught an alligator gar estimated to be over 300 pounds in May 2022. The alligator gar is sometimes referred to as a "living fossil" and, while it may look threatening, it's harmless to anything larger than itself.
The colorful superstars of backyard water gardens are actually ornamental varietals of domesticated carp.
It's one of the gentle giants of the sea. It loves sunbathing, dining on crabs and taking deep dives to the ocean floor.
By Mark Mancini
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The blobfish is actually pretty average looking in its normal habitat, but becomes a blob when it transitions from the pressure at depth to the water's surface.
Scientific divers from the California Academy of Sciences discover new species of dazzling, neon-colored fish.
The Gulf corvina is the loudest fish on the planet, helping lead to its overfishing and endangerment.
Shark shocker! This 'virgin birth' is the first example of a shark switching from sexual to asexual reproduction.
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Never mind the penis on its head, this weird ghost shark was filmed live for the first time, and hanging out in the wrong hemisphere.
In the past decade, several two-headed shark fetuses have been discovered. Is there something going on in the oceans we should know about?