Questions about Birds 395 



21. What foreign birds have been introduced into North America? 

 Which ones have multiplied here? Which ones are useful? 



22. Name a bird that formerly migrated in larger flocks than any 

 kind mentioned in this book, but is no longer seen. What caused it to 

 become extinct? 



23. Name some birds that were formerly abundant but have now 

 become rare. 



24. What clubs or societies promote the increase of useful birds? 

 What means do they employ? What do they accomplish? 



25. How are Nature Study Clubs organized? Do they make field 

 trips? 



26. If you were selecting glasses to use in observing birds, what 

 points would you consider besides their magnifying power? 



27. What is the best time of day for observing birds? 



28. Name the birds you would expect to see in the woods; in a 

 pasture; around a farmhouse; in a city. 



29. What birds sing most in the morning, and what ones sing most in 

 the evening? 



30. Do the voices of birds of the same species show any difference? 



31. Do birds give alarm notes or calls for help? 



32. Read about penguins ; the dodo; the great auk; the birds of 

 Paradise. 



