458 THE MAMMALS 



3. What are the reasons for considering the duckbill the most primitive of the 

 mammals ? 



4. How are the Marsupials advanced over the Monotremes yet more primitive 

 than the other mammals ? 



5. What factor seems to limit the minimum size of mammals? 



6. How does the cat family differ from the dog family in methods of capturing 

 prey? 



7. If you were shown the teeth from a rodent, a carnivore, and an ungulate, 

 how could you distinguish one from the other ? 



8. How is the complex stomach of the ruminants an adaptation for protection? 



9. How are whales adapted for their life in cold waters? 



10. What are the economic importances of the beavers ? 



11. Name the three kinds of primates. 



12. How does walking in the apes differ from walking in man? 



13. What are the functions of the four kinds of teeth in mammals? 



14. What three diverse groups of animals are found in the Edentata? 



15. Compare the sea cows with the whales. 



16. Can you think of any reason why the largest aquatic animal should be larger 

 than the largest land animal ? If so explain. 



17. Compare the brain size of the gibbon, orang, gorilla, and man. 



18. What is the hoof difference between the even-toed and the odd-toed ungulates ? 



19. How are the Chiroptera adapted for flight? 



