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Video / Animation

Do Mega Sharks Still Exist?

Best-selling author Sam Kean debunks the myth of the Megalodon, the 50-foot super shark that, despite what you may have read, is long extinct. In this video, Kean unravels the myth by explaining how the element manganese holds the key.…

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from article Astrapotheria

Skeleton of Astrapotherium magnum. The genus Astrapotherium is known from the late Oligocene to the late Miocene.

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from article Lycopsida

Lycopodium clavatum, a representative homosporous lycopsid. (a) Sporophyte showing typical rhizomatous growth and paired cones. (b) Microphyllous leaf. (c) Sporophyll bearing a sporangium on the upper surface. (From K. R. Sporne, The Morphology of…

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from article Marsupialia

Skull and jaws of marsupials. (a) Didelphidae, Didelphis (the carnivorous opossum of North America), Recent, with polyprotodont incisors (I 5/4). (b) Phalangeridae, Trichosurus (the herbivorous opossum of Australia), Recent, with diprotodont…

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from article Marsupialia

Views of the soles of the left hindfoot of marsupials. (a) Didelphidae, Didelphis, representing the five-toed, polydactylous condition. (b) Phalangeridae, Trichosurus, representing the five-toed, syndactylous condition (digits II and III are bound…

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from article Pholidota

Pangolin (genus Manis, order Pholidota). (Photo courtesy of the Wildlife Alliance)

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from article Hexactinellida

The dried siliceous skeleton of a glass sponge, Euplectella. (Credit: Randolph Femmer/United States Geological Survey)

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from article Hexactinellida

The class Hexactinellida includes living and fossil forms. Living hexactinellids: (a) Hyalonema (Cyliconema) thomsoni (order Amphidiscosida) and (b) Regadrella phoenix (order Lyssacinosida). Fossil hexactinellid: (c) Hydnoceras tuberosum (order…

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from article Hexactinellida