Listen to your favorite National Geographic news daily, anytime, anywhere from your mobile phone. No wires or syncing. Download Stitcher free today.
Thursday, October 28, 2010 |
Thursday, October 28, 2010 |
Photo: Birds That Sing Together Scare off InvadersThe longer the pairs stay mated, the more forceful and harmonious their song becomes, the study adds. Photograph courtesy Michelle Hall
|
ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
|
ADVERTISEMENT
|