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The fossil tooth whorl of the ancient shark Helicoprion , dating back 290 million years before present. For a long time, people didn't know what the shark looked like—but, thanks to a CT scan...
A behind the scenes look at the NMNH ocean-related collections and their...
Editor's note: Read Nick's first blog post about "toothed" baleen whales to see...
For the last 150 years, paleontologists have debated the origins of the great...

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How long have jellyfish lived in the ocean? This jellyfish fossil is from the Cambrian period, more than 500 million years ago. It was found buried in Utah —an area that used to be underwater, covered by the ocean. Fossil...
This well-preserved fossil is the only intact partial skull ever found of a...
Two fossilized teeth from a megalodon ( Carcharodon megalodon ) dating back...

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When the cod fishery collapsed in Newfoundland in the early 1990s, the hopes of the local fish harvesters collapsed with it...

The Ocean Blog

Nick Pyenson, the curator of fossil marine mammals at the Smithsonian's National Museum of Natural History, points to the skull and skeleton of a fossil "toothed" mysticete ( baleen whale ) on the...
Often it's the tiniest organisms that do the most harm. One example is microscopic algae, which can grow rapidly to form harmful algal blooms . Such blooms (some are called "red tides") create...
Long before great white sharks appeared, much larger ancestors roamed the ocean. This giant ancient shark -- the Giant Megatooth ( Carcharodon megalodon ) -- was probably big enough to eat a whale.
Paeleobiologist Dr. Nicholas Pyenson, Curator of Fossil Marine Mammals for the Smithsonian's National Museum of Natural History (NMNH), set out with Jorge Velez-Juarbe, NMNH Research Student and Ph...
These deep-sea sediment cores were drilled from beneath the seafloor, and hold information about millions of years of ocean and atmospheric chemistry. As dirt, dead organisms, and other particles...
Offshore Peru, during the Eocene (~56-34 million years ago), showing three archaeocetes (ancient whales), along with a previously described fossil penguin. Top to bottom: Perudyptes devriesi ,...
The Haplophrentis carinatus had two oar-like appendages (called “helens”) used to stabilize the creature and help it move along the ocean bottom.
The Ottoia prolifica has proven that cannibalism did exist in the Cambrian period since there have been portions of one Ottoia prolifica found in another specimen’s gut.
Monodontids, the group of whales that includes living belugas and narwhals, are emblematic symbols of the Arctic. However, the fossil record shows that these animals had a much larger range than the...
Paeleobiologist Dr. Nicholas Pyenson, Curator of Fossil Marine Mammals for the Smithsonian's National Museum of Natural History (NMNH), set out with Jorge Velez-Juarbe, NMNH Research Student and Ph...
George Mason University professor Mark D. Uhen and Dr. Matthew Lewin of the University of California, San Francisco, survey rocks of the Paracas Formation, in the southern part of Peru's Pisco Basin...
Opabinia was a strange looking creature: it had five mushroom-like eyes that allowed it to see predators approaching from many directions.
Two fossilized teeth from a megalodon ( Carcharodon megalodon ) dating back more than 20 million years. Their teeth can reach a diagonal length of seven inches! The ancestry of great white sharks has...
How long have jellyfish lived in the ocean? This jellyfish fossil is from the Cambrian period, more than 500 million years ago. It was found buried in Utah —an area that used to be underwater,...
For the last 150 years, paleontologists have debated the origins of the great white shark . Many believe that they descended from the 50-foot megalodon, also known as the megatooth shark (...
The Wiwaxia corrugata may have molted its scales in order to grow past these hard boundaries.
When paleontologists, like the Smithsonian National Museum of Natural History's own Nick Pyenson , curator of marine mammal fossils, dig up fossils in the field, they can't just toss them in their...
Paeleobiologist Dr. Nicholas Pyenson, Curator of Fossil Marine Mammals for the Smithsonian's National Museum of Natural History (NMNH), set out with Jorge Velez-Juarbe, NMNH Research Student and Ph...
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