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A relative of insects, trilobites lived on the ocean floor during the Cambrian period.
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Trilobites

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Offshore Peru, during the Eocene (~56-34 million years ago), showing two archaeocetes (ancient whales): Ocucajea picklingi and Supayacetus muizon.
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New Archaeocetes from Peru Are the Oldest Fossil Whales from South America

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Two men each hold a ceramic vessel at the archaeological excavation
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Archaeologists Study Early Whaling Community in Quebec, Canada

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An illustration of a recently discovered species of Monodontid, Bohaskaia monodontoides, and its beluga and narwhale relatives
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Smithsonian Scientists Describe a 'New' Fossil Whale

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A rendering of an underwater marine scene from the Cambrian Period, featuring an arthropod, annelids, and other animals.
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A Collection of Cambrian Fossils

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An image of a Anomalocaris canadensis fossil.
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Anomalocaris canadensis

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Smithsonian researchers eat a meal in preparation for a fossil excavation
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A Squalodontid Success

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Smithsonian Scientists Dig a Trench Around a squalodontid Skull
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Expedition to Excavate a Fossil Whale

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A researcher holds an arm bone from a "toothed" mysticete whale from Vancouver Island.
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Dispatches from the Field: Treacherous stream crossings and a new fossil find

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Nick Pyenson points to a skull and skeleton of a fossil whale.
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Excavating a "toothed" baleen whale from Vancouver Island

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Illustration of Opabinia with five eyes and what look like scales.
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Opabinia

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A fossil imprint of Ottoia prolifica.
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Ottoia prolifica

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