In another article an Atlantic tern which migrates from Nova Scotia to the North shore of South America were tested in a different manner. They were encased in a sphere which was painted black. Inorder to test the thesis, the scientists changed the day night cycle to get the bird on a standard time. When migration is about to begin the bird's genetalia shrink. Thus there is less body weight for the long migration. The sphere that housed the birds had minute holes which were made so that the Northern Hemisphere Celestial Sphere was portrayed. The inside of the shpere was covered with carbon paper and as the migration began the birds would try to launch themselves southward. From the bird tracks in the sphere the scientists concluded that these birds also performed a rudimentary form of celestial navigation.
Ain't it amazin'?