Migration is the movement of many species from one place to another, mostly based on seasonal changes, climatic changes, or habitat conditions. There are different types of animal migration, depending on what drives their migration and the patterns involved.
Examples include seasonal migration, a response to seasonal changes, and reproductive migration, in which case an animal can focus on traveling to selected breeding grounds. There is also latitudinal migration, which involves a change of latitude and migration from high altitude to low altitude. Finally, nomadic migration, which involves irregular movements based on resources.
Why Do Animals Migrate?
The main reason for the migration of animals is to improve living standards. They move to get ample food and suitable breeding grounds, escape harsh climates, and reduce predation risks. Migration, therefore, allows them to find water in times of drought and new habitats in cases where their existing habitats are threatened by environmental changes.
Birds That Make the Longest Migration in the Animal Kingdom
In the animal kingdom, some birds travel miles while migrating for various reasons; the Arctic tern is a perfect example. It is one of the most astonishing seabirds in the world, flying from the Arctic UK to the Antarctic and back every year. To put this into perspective, the birds cover over 40,000 miles annually.
Besides the arctic terns, the bar-tailed godwit has recorded one of the longest nonstop migrations. They go 11,000 km (6,835 miles) from Arctic breeding grounds in Alaska and Siberia to New Zealand to continue their summer and return in the spring.
Animals That Migrate During Winter
As aforementioned, animals migrate for various reasons; some do so specifically during winter. They include:
Monarch Butterflies
Monarch butterflies fly up to 3,000 miles from North America to central Mexico to avoid cold temperatures. They are guided by environmental cues that lead them south in the fall to aggregate at Mexico’s oyamel fir forests and pause to lay eggs on their way north in spring.
Caribou
Reindeer migrate across North American Arctic and sub-Arctic areas in search of food.
Whales
Most whale species move long distances from polar feeding grounds to tropical or subtropical breeding grounds.
Canadian Goose
These birds migrate from North America to the southern United States and Mexico in the winter. This is to avoid the cold since it affects the availability of food.
Leatherback Sea Turtle
Leatherback turtles perform long migrations between high-latitude feeding grounds and tropical nesting beaches, often across entire ocean basins in Florida.
Dragonflies
Dragonfly migration is considered a long-distance movement between breeding and feeding grounds and may be on the order of thousands of miles. They can cross large expanses of water, with their migration linked to life-cycle constraints.
Animals That Migrate in Africa
Some African countries such as Kenya, Tanzania, and South Africa are famous for being the perfect safari destination. One of the reasons why that is so is because of the animals that migrate in the region. They include:
Wildebeest
More than a million wildebeests, plus accompanying zebras and other animals, move around the Serengeti and Maasai Mara ecosystems. They search for fresh grazing land and are categorized as one of the “Seven Wonders of the Natural World.”
Flamingo
The search for better breeding and feeding conditions controls the flamingo migration. More specifically, greater flamingos migrate between shallow saline lakes, guided by changes in water levels and food availability. They fly in large groups, returning to the same breeding sites every season.
Aquatic Animals That Migrate
Animal migration is not limited to land and air species; aquatic animals also migrate. They include:
Zooplankton
Diel vertical migration, or zooplankton migration, is where these organisms move to surface waters at nightfall to feed on phytoplankton and return to deeper waters during the day when there is much light to avoid predators. This daily migration cycle is regulated by light and food availability.
Great White Shark
Great white sharks make large migrations for food and appropriate breeding areas. This mainly involves movement from the marine feeding areas near seal colonies to the warmer, more tropical waters for breeding.
Salmon
Salmon migration, or anadromous migration, is the movement of salmon from the ocean back to their original freshwater rivers and streams for breeding. Born in freshwater, they migrate to the ocean bodies for growth and maturity and then return to their place of birth to reproduce. This ensures they return to suitable spawning grounds to lay eggs and sustain their populations.
Humboldt Squid
The Humboldt squid makes daily vertical migrations from the deep waters to the surface waters at night for feeding and horizontal migrations along the eastern Pacific coastline from Chile to California. Seasonal migrations linked to breeding cycles and environmental conditions also take place.
Elephant Seals
Long migrations characterize elephant seals; for instance, northern ones move thousands of kilometers between breeding beaches along the Pacific coast to their ground. In contrast, the southern ones do from the sub-Antarctic islands to the Antarctic pack ice.
Atlantic Sturgeon
The Atlantic sturgeon is an ancient, anadromous fish that spends part of its life in the ocean and part in freshwater rivers for spawning. Spawning occurs in spring and early summer in rivers such as the Hudson. The juveniles remain in fresh waters for years, then proceed to the ocean.
Penguins
Penguins migrate from one region to another for breeding and feeding areas. Specific patterns differ among species, but not all migrate like the African penguins. Emperor penguins migrate inland in Antarctica for extreme breeding conditions, while other penguins migrate to oceanic feeding grounds rich in fish, squid, and krill.
Land Animals That Migrate
Examples of land animals that migrate include:
Topi
Topi antelopes migrate depending on seasonal food and water availability changes. During the wet season, the animals move about their home ranges in search of new grass, while in the dry season, they aggregate around permanent water sources.
Galapagos Tortoise
The locomotory behavior of Galápagos tortoises is limited to localized searching around the islands in search of food, water, and suitable nesting sites. During dry seasons, females travel to identify nesting sites to deposit their eggs in places that have appropriate soils and temperatures for incubation.
Christmas Island Red Crabs
The Christmas Island red crab migration occurs in a rainy October or November. Several million red crabs move from the forest to the coastline for breeding, covering a few kilometers. Upon reaching the coast, the males dig burrows for mating, after which the female releases eggs after two weeks.
Do Animals Face Any Challenges During Migration?
The challenges of animal migration are numerous: high energy demands, vulnerability to predation, inclement weather, and physical barriers such as mountains and roads. Habitat loss, human activities, pollution, and climate change further disrupt their journey and enhance risks.
Migration stress can also weaken immune systems, making them more susceptible to diseases. Birds are not the only animals migrating; mammals, fish, insects, reptiles, amphibians, and crustaceans migrate in search of food, breeding, and a better climate.
