The successive skeins of birds flying in a constant direction year after year would afford evidence that land lay in that direction and even provide a useful method of maintaining course if the sun and stars failed.
Izikhinkci eziphumeleleyo zeentaka ezibhabhayo iindlela ezizingisayo unyaka emva konyaka bezinokukuba nobungqina ukuba umhlaba ulele kula ndlela nokuba unika indlela ezincedayo zokulungisa indlela ukuba ilanga neenkwenkwezi aziphumelelanga.