Breadcrumb Home Search Showing results for Language Content type Article (2) Slideshow (2) Video (2) Photo (1) Article Type Article (1) Personal Perspectives (1) Topics (-) Extinctions (7) Ancient Seas (5) Marine Mammals (4) At The Museum (2) Extinctions (2) Evolution (1) Exploration (1) Habitat Destruction (1) Invertebrates (1) Plants & Algae (1) Tags Whales (4) Endangered species (3) Fossils (3) Smithsonian scientists (3) Ancient sea life (2) National Museum of Natural History (2) Paleobiology (2) Scientific illustrations (2) Seagrass (2) Seals & Sea Lions (2) Site Search Sort by RelevanceTitle SortAuthored on Order AscDesc Sort By RelevanceA-ZZ-ANewestOldest Article Whale fossils on the mainland, and into a CT scanner May 2012 Read the Full Article Slideshow Endangered Ocean Animals December 2013 See the Full Slideshow Video Excavating an Extinct Toothed Whale June 2011 Watch the Video Article Flippers or Feet? An Extinct Mammal May Have Been Replaced By Today's Sea Cows August 2016 Read the Full Article Slideshow The Ocean Throughout Geologic Time, An Image Gallery September 2011 See the Full Slideshow Photo Cretaceous-Paleogene Boundary (65 Million Years Ago) September 2011 View Image Video Efforts to Protect the Critically Endangered Monk Seal June 2011 Watch the Video