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.
Ngexesha lamva lokwahlukana kwenkulungwane, ngaka oko, eyena nto wayezimisele kukuthi phuhlu yakukuthetha phakathi kukufundisa ngesingesi kubaqhubi benqanawa.