Today's Catch

The dwarf lantern shark sits in a human hand.

Dwarf Lantern Shark

The smallest shark, a dwarf lantern shark ( Etmopterus perryi ) is smaller than a human hand. It's rarely seen and little is known about it, having only been observed a few times off the northern tip of South America at depths between 283–439 meters...

Shark Embryo

Sharks have young in three different ways. After internal fertilization, some species lay a thick egg case that encloses the shark embryo (seen in the photo here). Most species are ovoviviparous, which means that the shark hatches and develops...
Shark Sizes: Whale Shark 46 feet, Basking Shark 33 feet, Great White Shark 23 feet, Megamouth Shark 15 feet, Nurse Shark 13 feet, Mako Shark 8 feet, Blacktip Reef Shark 6.5 feet, Bonnethead Shark 3.4 feet, Dwaf Lantern Shark 6 inches

What is the Biggest Shark? A Chart Shows the Diversity of Shark Sizes

Sharks come in all sizes. The largest is the whale shark , which has been known to get as large as 18 meters (60 feet). The smallest fits in your hand. And the great white shark is somewhere in the middle. See photos and learn more about the wide...

What If There Were No Sharks?

What would happen if we let our fear of sharks lead people to kill them all? This is the question Joe Hanson asks in this video from PBS Digital Studios. Find out about how the removal of sharks affects the food web, ecosystem balance, and why...
An American crocodile rests on a bed of seagrass.

American Crocodile

An American crocodile ( Crocodylus acutus ) resting on a bed of seagrass . These medium-sized crocodiles are most commonly found in mangrove -lined estuaries and saltwater lagoons between the southern coast of the United States and the northern...
The weedy sea dragon male can hold around 250 eggs in his pouch.

The Dragon of the Sea

Just like other seahorse species, male weedy sea dragons are the ones to get 'pregnant' and give birth to the babies. To show he is ready to hold eggs, the male wrinkles part of his tail. On this signal, the female places around 250 eggs onto a...
The giant squid’s enormous eyes help it find prey in the dark ocean depths.

Largest Eye in the World, Giant Squid

Giant squid have the largest eye in the animal kingdom. At up to 10 inches in diameter, people often describe it as the size of a dinner plate -- or, in other words, as big as a human head. Here, National Museum of Natural History staffer Katie...
Anemone porcelain crabs can avoid predators by not only living in anemones but by willing loosing appendages to avoid infection.

The Porcelain Crab

Anemone porcelain crabs may look delicate but they have their own sort of armor: a hard exoskeleton. They live under rocks, sponges, groups of feather stars, and even in giant anemones where they can hide inside the tentacles. Once inside they do...

Song of the Spindle

Illustrator Drew Christie created this light-hearted short film about how humans could really learn something from whales. Check it out and learn about all the different cetaceans and our commonalities, such as a shared love for vacations in Hawaii...
Red hot magma and ash erupt from an underwater volcano.

An Underwater Volcanic Eruption

A volcanic eruption of superheated magma (some 2,200 degrees Fahrenheit) from the West Mata Volcano produces a bright flash of hot magma that is blown up into the water before settling back to the seafloor. The explosion throws ash and rock into the...

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