We know when they go, which birds go where, over what route. Some are truly incredible jour-neys. The sandpiper goes from Can-ada to Tierro del Fuego. The golden plover travels from the arctic to the pampas of Argentina. Some barn swallows go 9000 miles from Alaska to Patagonia.
Scandinavian swallows end up at the southern tip of Africa.
Little warblers weighing less than an ounce take solitary night journeys from Germany to central Africa. Those are the things we know. What still baffles scientists is the how. For each new theory advanced, tests were per-formed which disproved it. A species of stork when migrating south through the North American plains makes an abrupt turn to the west at approxi-mately Great Falls, Montana to cross the Rockies.