Do whales and dolphins sleep?



   1.      What class do whales and dolphins belong to? Why?

   

   

   

   2.      Compare whales and dolphins with humans. What do they have in common, what are the
   differences?

   

       

   +--------------------------------------------------------------------------------------------+
   |               |             similarities             |             differences             |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |---------------+--------------------------------------+-------------------------------------|
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |whales dolphins|                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |---------------+--------------------------------------+-------------------------------------|
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |humans         |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   |               |                                      |                                     |
   +--------------------------------------------------------------------------------------------+

   

   

   3.      Read Paragraph 1 and complete the new information into the chart.

   

   4.      What is so unique about the respiratory system of whales and dolphins?

   

   

   

   

          Read Paragraph 2 and complete your answers.

   

   

   

   5.      How do whales and dolphins sleep?

   

   

         Read Paragraph 3. Work in pairs. Student A recapitulates. B asks additional
           questions.

   

   

   6.      Prediction – what method was used to discover this phenomenon in dolphins?

   

   

   

          Read Paragraphs 4. Student B describes the method to A.

   

   7.      Go quickly through the whole text and mark a borderline between the facts and the
   hypotheses.

   

   

   Language focus

   

   8.      What other systems besides respiratory system do you know?

   

   9.      Complete the sentences:

   §         Mammals are ........-blooded animals, reptiles are .........-blooded.

   §         Most .......... give birth to live young.

   §         Kangaroos, wombats, bandicoots, opossums, and related animals do not develop a true
   placenta and they usually have a pouch on the abdomen of the female which covers the teats and
   serves to carry the young. They  are called  ........

   

   10.  Paragraph 3: find the words that mean

   §         possible or reasonable

   §         capable of life or normal growth and development

   

   12.  What is the plural of phenomenon 

   

   13.  The following statements are either true or false.

   

   Whales and dolphins

   can spend half an hour underwater without breathing.

               are semi-conscious breathers.

              “sleep” 1/3 of the day.

               preferably sleep near sandbanks.