Rooplekha Das
Over 1.5 million wildebeest, accompanied by zebras and gazelles, cross the Serengeti and Maasai Mara in search of fresh grazing, with dramatic river crossings between July and September.
Every winter, millions of monarch butterflies travel from Canada and the United States to Mexico's Oyamel fir forests, covering trees in vibrant orange and black wings from November to March.
Elephant herds travel hundreds of kilometres between the Okavango Delta, Chobe, and Zambezi river systems in search of water, with large gatherings around permanent water sources during June and October.
The Porcupine caribou herd travels up to 1,600 kilometres annually between Canada's Yukon and Alaska's Arctic National Wildlife Refuge, moving towards northern calving grounds in spring before returning south in autumn.
Every winter, enormous shoals of sardines move northwards along South Africa's eastern coastline, attracting dolphins, sharks, whales, and seabirds in one of the ocean's largest feeding spectacles.
Every winter, thousands of demoiselle cranes arrive in Khichan village, Rajasthan, after travelling from Central Asia. The village's longstanding bird-feeding tradition makes it a celebrated destination for birdwatchers.
Humpback whales travel thousands of kilometres between polar feeding grounds and tropical breeding waters. Seasonal sightings along Hawaii, Mexico, Colombia, and Tonga offer opportunities to witness their spectacular breaches and displays.