City birds are changing their tune
The Weird, Fragmented World of Social Media After Twitter - The Atlantic
Some birds change their song to adapt to the noise of the city
10 Bizarre Birds
Backyard Birds The Nature Conservancy
The Yellow Bird Sings (CD-Audio)
How Migrating Birds Use Quantum Effects to Navigate - Scientific American
Tweety - Wikipedia
Save Birds. Save Life. - BirdLife Australia
Northern mockingbird - Wikipedia
To Feed or Not to Feed Wild Birds
Wild Birds Unlimited
Bird's First Day on the NYSE Ends Flat