Những Cuộc Di Cư Vĩ Đại Nhất Của Động Vật

For a long time since the formation of the Earth animal species have chosen migration to find food shelter and better living conditions The remarkable thing is that this type of behavior not only exists in a few animal species but is widespread across the board cluding birds fish mammals reptiles amphibians insects and crustaceans Typically individuals of the same species gather into vast chaotic crowds as a way to protect themselves from predators The reasons behind this migration movement can vary greatly Some species follow weather cycles to maintain access to water and food while others return to familiar breeding grounds The mass migration of millions of wildebeest across the savannas of Africa is likely the greatest spectacle of migration on our planet The migration route of approximately 1.5 million saiga antelope seems to have no true beginning or end and a large number of zebras antelopes and other animals During their migration the nilgai face countless dangers along the way One of them is the challenge of crossing the river facing a swarm of deadly crocodiles They were forced to plunge into the Mara River to reach the other side Even if they escape the crocodile's jaws nilgai can still drown due to crocodile attacks or trampling Besides crocodiles nilgai also face other predators such as lions and hyenas always lurking on the opposite bank During the perilous river crossing approximately 1 300 herds of nilgai tragically perished never making it to the far bank Despite such dangers the greater kudu is indeed a courageous animal They are always ready to face death in order to reach the other side to arrive at a new source of life Salmo No one knows exactly when it started but whenever the nickname "king of fish" comes up people immediately think of salmon Perhaps it's because it fulfilled its noble destiny the one set forth by nature: to make a single magnificent journey in its lifetime Even though they know that traveling means certain death salmon always passionately strive to reach the final destination of their journey—ensuring the survival of their species Only by witnessing entire schools of salmon thrashing and surging upstream against the waterfall's force do we truly grasp the extraordinary strength of this remarkable fish Salmon are the most peculiar and mysterious fish with truly enigmatic behaviors They have slender silvery bodies with a glowing aura that moves in a remarkably beautiful pattern Atlantic salmon spend their first few years in small streams and rivers feeding on aquatic insects and other drifting organisms carried by the water Once they reach a length of about 10 cm they begin moving out to the open ocean Here salmon capitalized on the abundant food supply growing rapidly while evading numerous predators such as seals and larger fish to survive After spending one to two years at sea salmon begin their journey back Upon returning to their homeland the first thing they did was search for a suitable location to build their nest When it finds a suitable spot it tilts its body and uses its claws to sweep the pebbles aside letting them slide to one side Building a nest usually takes an entire day to complete At this stage the male stays close to the female to drive off other fish that attempt to encroach After the female fish lays her eggs in the nest the male releases milky-white sperm to fertilize them The female waits until the fertilized eggs sink before fanning the gravel to cover them After fulfilling their noble duty the female and male fish died together side by side It let itself drift downstream with the current That river was also where it sent its broken body to end its great devoted journey You've probably seen those before but red crabs are quite different Seeing hundreds or even millions of red crabs all at once is something not everyone is lucky enough to witness It is a small island of Australia in the Indian Ocean It is home to a rich and unusual variety of plants and animals What makes this island unique is the remarkable annual migration of red crabs from the dense forest to the coastline following the breeding season The red crab migration typically begins at the end of the year from October to December Since the rainy weather made it easier and more convenient for them to move around The male crabs will lead the first wave of migration followed by the full participation of the female crabs Each crab must travel a distance of 8 kilometers within 9 to 18 days At first glance it sounds easy but for a creature as small as the red crab it's actually a very long journey Once reaching the sea male crabs seek out and dig burrows to hide while females employ the strategy of "hunting for a bull by poking a stake " They come to these holes to mate with male crabs and then crawl out to the sea to lay their eggs Each annual migration involves up to several million mature red crabs Due to the large number of red crabs migrating local authorities have installed road and pedestrian closure signs which will remain in place for at least a week Every time the migration occurs it disrupts island life as thousands of red crabs casually crawl across roads through lawns and even into homes However the locals here aren't bothered at all—they're actually thoroughly delighted The next migration is that of the Arctic tern To date among all animal species known to humans this tiny bird holds the record and has shattered all previous benchmarks for migration distance These Arctic terns will fly from a breeding ground in northern Canada migrate to the southern tip of Antarctica and then return to their original location According to the latest calculations by scientists the Arctic tern travels only once each year from one end of the world to the other However on average each of these tiny birds must travel about 70 000 kilometers annually According to scientists this small bird species has an exceptionally long lifespan capable of living for more than 30 years Thus over the course of its life each Arctic tern will fly approximately 2.4 million kilometers This distance equals three times the round-trip journey from Earth to the Moon S Whether large or small this is the largest marine iguana and the fourth-largest reptile after three crocodile species They travel up to 10 000 kilometers from Canada to the Caribbean and from Alaska to Indonesia No one knows how they navigate from feeding grounds rich in their preferred food such as jellyfish to the beaches where they lay their eggs However scientists believe the third eye of the tuatara is actually a spot on the top of its head that allows light to reach the pineal gland The small endocrine gland located in the brain of vertebrate animals Activating the device initiates the migration journey at the precise time of year And at the legendary slow pace of the journey no one knows how many years it will take for the tribe to complete their migration Does anyone know Please share your thoughts in the comments below Hello and see you again