How do the Migrating birds reach the same destination every year fromfar countries?
609755
It's a good question, and one that is still not fully answered.  When we speak of "instinct," as some of the other answerers did, we actually asign the problem to a black box and leave it pretty unanswered.  Instinct alright, but the question remains: HOW?  \n\nNow, there are two means that have been found to be apparently of importance for migrating birds.  One is magnetic field orientation, the other is visual orientation.  Both seem to be involved partially or exclusively, but how exactly they work remains a bit of a mystery.\n\nIn order for an animal to orient itself along the magnetic field of the earth, it has to somehow sense the field.  This can either work by means of having magnetic substances in the body, that will align according to the magnetic field.  Their alignment must then be sensed by the organism.  Some organisms have magnitide enclosed in their body that serves this function.  However, in birds nothing like it has been found.  Nevertheless, birds do use magnetic fields, and so the question remains: HOW?\n\nElasmobranchs (sharks, skates, and rays) actually orient themselves according to the earth's magnetic field using electric currents.  It's a simple but very impressive physiological achievement.  If you move a charge through a standing magnetic field, you will induce an electric current.  This is due to the Lorentz force, which will act on the charge (F = q v B sinØ).  The right hand rule will give you the direction of the Lorentz force.  If the shark swims in an eastern direction, the Lorentz force will pull upwards, so that the direction of the induced electric field is a dorso-ventral one (i.e., one pol is on the back of the animal, from where the current flows to the other pol on the belly of the shark).  If the shark were to swim the opposite direction, the electric current would run the other way.  With its electrosensitive organs (Ampullae of Lorenzi), the sahrk can sense the direction of the current and figure out which direction it swims.  It's an electromagnetic compass.  However, birds have no electrosensitive receptors...\n\nNow, birds also use visual cues.  These seem to be primarily stars, which is of course great for navigation.  Landmarks, like mountains etc. may also play a role.  \n\nBut again, how this works in detail is not fully understood.  Let me know once you figure it out!!!
76009
The migration patterns of the flock of geese can be tracked very easily.
718848
http://en.wikipedia.org/wiki/Bird_flight
1021864
they are usually called back to their home country
907274
what do you need to know?\n\nthey are widest down south, and get narrow up north (as the mountains get closer to the sea).\n\nalong the sea, they are lined with inlets and wetlands that are prime bird migration habitats, and were easily linked to form the Intracoastal Waterway.
701067
Birds of a feather flock together.
673616
they fly south dont they? to warmer location
133062
Check the link below for even more information:\n\nCorpus Christi - Where the Birds Funnel South: Although the birding is good year-round, September and October are exceptional months to visit Corpus Christi, Texas. The highlight is the migration of Broad-winged Hawks, with more than 100,000 birds per day possible at Hazel Bazemore County Park during the last week of September. Twenty-four other species of raptors or vultures can be seen at the hawk watch.
744143
Many African wildlife migrate to areas with the most available water, in areas where the seasons have very different rainfall. These animals can include zebras, wildebeests, buffaloes, elephants. \nhttp://www.aims.gov.au/ibm/pages/news/wetlands-tanzania.html\n\nDucks, geese, and other water birds or shore birds that normally live in lakes, lagoons, or beaches,  migrate with the seasons--go from wet area to wet area during their migration. They may travel across continents. \nhttp://www.wetlands.org/articlemenu.aspx?id=3adc7b5a-ba02-4d1a-aabe-3292116e6cf4
504985
They can be transmitted other ways.  They can leave their homes an migrate to a new place pretty easy.
796385
You Gotta Be Kidding Me Buddy...\n\nWinter is not an easy time for birds. Not all of them are genetically programmed to head south for the duration. Imagine if you had to stay outside in freezing weather the entire winter! A bird-friendly habitat may make the difference to their survival.\n\nThe birds that visit your neighborhood vary with the seasons-not only the species, but also the individuals. Some species, such as downy woodpeckers, may be year-round residents. Others-dark-eyed juncos and ruddy ducks for example, are winter visitors. You will see hummingbirds only from late spring until early fall. Species such as rose-breasted grosbeaks may visit only during spring and fall migration. Robins may migrate only a few miles, and return temporarily if the weather becomes milder.\n\nMany birds flock together for survival in the winter. The ones that seem to be most noticeable are starlings and crows. Starlings may gather by the thousands. Once they have flocked, breaking up the flock may mean death to many of its members. Practice and teach tolerance. The most effective way to prevent flocking is to change the habitat, but this should be done in the warm season.\n\nglycerin and antifreeze will kill birds!!!
641877
Step 1] They take picture of the entire are from a satellite [Bird eye view]\n\nstep 2] Using the latitudes and longitudes they pin point each place on the map\n\nSTep 3] to calculate the distance, they use these as co ordinates and calculate the distance\n\nstep 4] for directions, the map are of high resoultion, so you can easily the chart your way point, and covering the entire journey in the shortest posible manner
127140
That is a good question. Some birds and some insects use the magnetic field of the earth to give them clues for navigation, along with landmarks, and polarization of light etc. My guess is that at first they might be a little confused, but they use multiple clues, so they would soon adjust and learn the new pattern. \n\nAfter all, it flips fairly often on earth's time scale.  Apparently on average it flips every 300,000 years, and  the last flip was 780,000 years ago, so we are a bit overdue at the moment. Obviously, the birds have survived through lots of flips, and movements of the earth and landmarks etc. So they will probably survive the next flip too, but not necessarily without some confusion.
391141
Migration- The process when one living thing moves from one place to another to avoid food shortages.\nEndangered- A living thing who is at risk of becoming extinct due to environmental or predatory changes.\nExtinct- A species whose last member has died.\nHabitat- The biome which a species lives in.\nHibernation- A period of regulated hyperthermia used to conserve energy during winter months.
960140
Here is a bunch of links, responding to all of your questions:\nhttp://www.closertonature.com/outdoors/bird-migration.htm
654829
Yes, they migrate south, along the thermal currents rising from the highlands of New England, down to Hawk Mountain in Pennsylvania. They continue riding these thermals down the Appalachians to the southeast then west to Texas and into Mexico and Central America. They often migrate in large groups, spiraling up and down - it's an awesome sight!
664336
It is moving from   country to country via waterfowl migration.  It is likely to arrive in the US during the next migration back in the spring of 2007.  People who raise poultry have been working on plans to keep their flocks inside poultry houses to avoid contact with wild birds.\nShould bird flu be detected in the bird population, the public will be advised of sanitary procedures, such as not handling dead birds and wiping shoes before entering a home.