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 Long ago, the sky over California was full of condors. Today, however, the sky is full of airplanes. People have taken over the condor's space, so these big birds with giant wings are dying out. Condors once flew along the Pacific Coast from Canada to Mexico. Then people moved into the woods where the birds lived. By 1970, there were only about 50 condors left along the coast. Now there are less than 30. None of these birds may be left in 20 years. Most people think the condors should be saved. People have different ideas for helping the birds.

① Birds of America                 

② Big Birds in Zoos                

③ Condors in Danger

④ How to Tame Birds              

⑤ The Sky over California