Breadcrumb Home Search Showing results for Language Content type Article (2) Photo (2) Slideshow (2) Video (2) Article Type Article (1) Personal Perspectives (1) Topics (-) Extinctions (8) Ancient Seas (5) Marine Mammals (4) At The Museum (2) Extinctions (2) Conservation (1) Evolution (1) Habitat Destruction (1) Invertebrates (1) Plants & Algae (1) Sharks & Rays (1) Tags Endangered species (3) Scientific illustrations (3) Whales (3) Ancient sea life (2) Fossils (2) Seagrass (2) Seals & Sea Lions (2) Smithsonian scientists (2) Site Search Sort by RelevanceTitle SortAuthored on Order AscDesc Sort By RelevanceA-ZZ-ANewestOldest Slideshow Endangered Ocean Animals December 2013 See the Full Slideshow 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 An Extinct Mammal May Have Been Replaced By Today's Sea Cows August 2016 Read the Full Article Slideshow The Ocean Throughout Geologic Time, An Image Gallery September 2011 See the Full Slideshow Video Efforts to Protect the Critically Endangered Monk Seal June 2011 Watch the Video Video Are Sharks Scary? December 2009 Watch the Video Photo Cretaceous-Paleogene Boundary (65 Million Years Ago) September 2011 View Image Photo Carbonate Reef (Cretaceous Period: 145 - 65 Million Years Ago) December 2009 View Image Article Whale fossils on the mainland, and into a CT scanner May 2012 Read the Full Article