A sideways view – Millions of red crabs living on Australia's Christmas Island make their way to the sea to mate and, eventually, lay their eggs.
Serengeti stampede – Over a million wildebeests trek north in the Serengeti each year and attempt to cross the Grumeti River. The water is infested with crocodiles, and many of the animals fall victim to the aquatic predators.
Aerial ballet – When starlings make their yearly winter migration, they travel en-masse. Some equate their unusual formations to an aerial ballet. Last January, they traveled to Israel -- the first time they'd visited the country in 20 years.
Sea turtle spotting – Sea turtles often migrate hundreds (sometimes thousands) of miles between their breeding and feeding grounds. Freshly hatched baby turtles will head to the sea to find cover from predators and a ready food source. Green sea turtles in Indonesia (pictured) face an added danger from poachers, who can turn a high profit by trading turtle eggs.
Pachyderm parade – Elephants migrate thousands of miles to find food and mate. Over the years, human development has destroyed many migratory routes. One area that still attracts pachyderms far and wide, however, is Minneriya, Sri Lanka, which bears witness to a great gathering of elephants come August.
Mating monarchs – Thousands of monarch butterflies descend into Pacific Grove, California from October, and stay throughout the winter months. Around Valentine's Day, the butterflies stick around to perform their mating rituals.
Whale of a time – Between June and November, humpback whales undertake a seasonal migration from the Antarctic Peninsula to the equatorial coast of Colombia to breed, feed and rest.
Crane your neck – Greater sandhill cranes migrate to the San Luis Valley in Colorado late winter every year. More than 25,000 cranes stop to rest and feed as they travel from their wintering grounds of Mexico, Arizona and New Mexico to their summer homes in the northern Rocky Mountains.
Flaming flamingos – Migratory birds, greater flamingos rest at the Nal Sarovar Bird Sanctuary near Ahmadabad. Mainly inhabited by migratory birds in winter and spring, it is the largest wetland bird sanctuary in Gujarat, and one of the largest in India.
Run, sardine, run! – The sardine run along South Africa's east coast is an annual event attracting thousands of locals and tourists. Each year massive shoals of sardines stretching hundreds of miles draw sharks, dolphins and gannets hovering above the fish.