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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...
The fossil tooth whorl of the ancient shark Helicoprion , dating back 290...
A behind the scenes look at the NMNH ocean-related collections and their...
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Editor's note: Read Nick's first blog post about "toothed" baleen whales to see...

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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 , unnamed protocetid, Ocucajea...
How long have jellyfish lived in the ocean? This jellyfish fossil is from...
This well-preserved fossil is the only intact partial skull ever found of a...

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When you're standing in a museum surrounded by fossils, you can almost imagine drifting through time to when long-extinct...
Paleobiologist Mark D. Uhen drills away rock to reveal the fossilized bones of Peruvian archaeocetes (ancient whales), in the Vertebrate Paleontology Department at the Museo de Historia Natural de...
A reconstruction of a new fossil beluga relative, Bohaskaia monodontoides , described by Smithsonian scientists, is in the foreground. Its living relatives, the beluga and narwhal, are illustrated...
Jorge and I arrived in Panama City around 3 pm this afternoon, and took a taxi to the Smithsonian Tropical Research Institute (STRI)'s headquarters in the Gorgas neighborhood of downtown Panama City...
A fossil vertebra that a Smithsonian researcher's mother found while prospecting in the Gatun Formation. It's not just any vertebra, it belongs to a fossil sea cow! According to Jorge Valez-Juarbe, a...
The evolution of whales represents one of the great stories in macroevolution. It's a narrative that has mostly benefitted from an extraordinary series of fossils recovered from rocks around the...
Globotruncana falsostuarti -- a foram that lived about 75 million years ago, during the Cretaceous Period, from southeastern Tanzania. By measuring the chemistry in the shell, scientists can estimate...
The Wiwaxia corrugata may have molted its scales in order to grow past these hard boundaries.
Dugongs , along with manatees , make up a group of marine mammals called sirenians or seacows . In the modern world, only one species of seacow is found in any one place in the world. However, 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...
This well-preserved fossil is the only intact partial skull ever found of a white shark that lived about 6.5 million years ago called Carcharodon hubbelli . The fossil jaw contains 222 teeth, some in...
On a beach in Piña, Panama the tide is rolling out. Faint outlines of skeletal remains rise above the sand. Smithsonian scientists Nicholas Pyenson and Aaron O'Dea along with a team of students...
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...
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,...
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...
During the late Cretaceous period, Kansas was covered by a vast sea. There, scientists have found fossils of Squalicorax sharks (also called crow sharks) that lived 70-80 million years ago. They were...
A relative of insects, trilobites lived on the ocean floor during the Cambrian period. Some would curl up like pill bugs while others burrowed underneath sand and mud.
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 (...
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...
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