Millions of birds follow a 9,000-kilometre invisible highway every year, crossing mountains, deserts and oceans without a map |
[ad_1] Every year, as the seasons change, millions of birds undertake one of nature’s greatest journeys. Some travel only a few hundred kilometres, while others fly thousands without recognising political borders or national boundaries. Instead, they follow ancient migration routes known as flyways, natural aerial corridors shaped by geography, climate and the availability of food…
