Breadcrumb Home Search Showing results for Language Content type Photo (22) Article (12) Slideshow (3) Article Type Personal Perspectives (7) Article (2) Topics (-) Extinctions (37) Ancient Seas (22) Marine Mammals (13) At The Museum (11) Evolution (4) Sharks & Rays (4) History & Cultures (2) Careers (1) Exploration (1) Extinctions (1) Fishing (1) Invertebrates (1) Plants & Algae (1) Technology (1) Temperature & Chemistry (1) The Seafloor (1) Tags Paleobiology (26) Smithsonian scientists (21) Whales (18) Fossils (15) Ancient sea life (10) National Museum of Natural History (9) Smithsonian collections (9) Scientists at work (8) Behind-the-scenes (4) Geology (4) Adaptations (3) Geologic periods (3) New discoveries (3) Smithsonian Tropical Research Institute (3) Maritime history (2) News (2) Technology (2) Site Search Sort by RelevanceTitle SortAuthored on Order AscDesc Sort By RelevanceA-ZZ-ANewestOldest Slideshow Shark Ancestors December 2009 See the Full Slideshow Pagination Previous page Page 1 Page 2 Page 3 Current page 4