"The happening was migration. It was full upon the Northern Hemisphere. The shorter hours of sunlight and lowering temperatures were telling millions of birds to go south. The event had begun in mid-August. The loons, geese, ducks, and shorebirds had heard the message and had left the barrens of Alaska and Canada. A few days later the swallows and swifts felt the change and left the Northeast.
And then it happened. Frightful hopped from limb to limb until she reached the wispy top of the ancient hemlock. She took a bearing on the sun's rays. She fixed on a longitude between ninety and seventy degrees. After many takes, the direction was indelibly printed on her brain. She pointed her head and body along the invisible line. She bent her knees and ankles. She lowered her wings.
Frightful flew. She did not look back. She rode the prevailing wind over mountains and rivers into unknown territory..."
~ Frightful's Mountain by Jean Craighead George (A favorite little trilogy from my school teaching years - My Side of the Mountain, On the Far Side of the Mountain, and Frightful's Mountain)