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  1. 1. WHALES Done by: Saif
  2. 2. <ul><li>Whales are mammals. </li></ul><ul><li>All mammals share some features. </li></ul>
  3. 3. <ul><li>Whales belong to a group of mammals called the Cetacean. </li></ul><ul><li>Cetaceans have two features that other mammals don’t have. </li></ul>
  4. 4. <ul><li>Cetaceans are split into four groups. </li></ul>No Cetacean group Baleen plates? Teeth? Echo-location? Baleen Sperm Other toothed Beaked Yes No No No Teeth in lower jaw only Many teeth Few teeth No Yes Yes Yes
  5. 6. <ul><li>From the evidence so far, baleen whales are more different. </li></ul><ul><li>There are 11 species of baleen whale. </li></ul><ul><li>They include blue whales and sperm whales. </li></ul>
  6. 7. Q5, Q6 <ul><li>But in the 1990s new evidence was found. </li></ul><ul><li>Scientists looked at DNA from 16 species of cetaceans. </li></ul><ul><li>The DNA showed that: </li></ul><ul><li>- Sperm whales were more closely related to baleen whales than other groups. </li></ul><ul><li>- Beaked whales are only distantly related to any of the other groups. </li></ul>
  7. 8. The End