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Topic: Bird migration


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In the News (Fri 14 Jun 19)

  
  NPWRC :: Migration of Birds
The older birds may be accompanied by some of the young, but most of the immature birds leave their natal grounds later in summer after the adults and move southward through the interior of the country, returning in spring over essentially the same course.
Dog-leg migration patterns are characterized by a prominent bend in the route.
Because the Bobolink is a bird of damp meadows, it was originally cut off from the western states by the intervening arid Great Plains, but with the advent of irrigation and the bringing of large areas under cultivation, small colonies of nesting Bobolinks appeared at various western points.
www.npwrc.usgs.gov /resource/birds/migratio/patterns.htm   (3616 words)

  
 Reference.com/Encyclopedia/Bird migration
Migratory birds may use two electromagnetic tools to find their destinations: one that is entirely innate and another that relies on experience.
Bird migration has been studied by a variety of techniques of which ringing is the oldest.
The orientation behaviour of the bird inside the cage is studied quantitatively using the distribution of marks that the bird leaves on the walls of the cage.
www.reference.com /browse/wiki/Bird_migration   (3552 words)

  
  Bird migration
Most species of land birds migrate very long distances, the most common pattern being for birds to breed in the temperate or arctic northern hemisphere and winter in warmer regions, often in the tropics or the temperate zones of the southern hemisphere.
The advantage of the migration is that, in the long days of the northern summer, breeding birds have more hours to feed their young on often abundant food supplies, particularly insects.
Another cause of birds occurring outside their normal ranges is the "spring overshoot" in which birds returning to their breeding areas overshoot and end up further north than intended.
www.photobirds.com /pub_3_Bird_migration.html   (2383 words)

  
 All About Birds : Migration
Birds that nest in the northern hemisphere tend to migrate northward in the spring to take advantage of burgeoning insect populations, budding plants and an abundance of nesting locations.
Migrating birds can cover thousands of miles in their annual travels, often traveling the same course year after year with little deviation in the path followed.
Spring migration is an especially good time for those that feed birds in their backyard to attract species they normally do not see.
www.birds.cornell.edu /AllAboutBirds/studying/migration   (1192 words)

  
 Birding in India - Bird Migration - Bird Ringing - Bird Banding
Migration is the mechanism behind the seasonal appearance and disappearance of some species of birds, mammals, fish and insects.
Timing of migration is a mix of internal stimulus which results in a feeding binge to put on fat to survive the journey and then the tendency to aggregate into flocks.
Migrations mostly consist of birds flying south for the winter and north in spring to breed.
www.birding.in /bird_migration.htm   (965 words)

  
 North American Migration Flyways
Bird migration is generally thought of as a north-and-south movement, with the lanes of heavier concentration following the coasts, mountain ranges and principal river valleys.
Migration routes may be defined as the lanes of individual travel from any particular breeding ground to the winter quarters of the birds that use them.
The southward route of migratory land birds of the Pacific Flyway that in winter leave the United States extends through the interior of California to the mouth of the Colorado River and on to the winter quarters that are principally in western Mexico.
www.birdnature.com /flyways.html   (1820 words)

  
 Arctic Refuge: Bird Migration
Because this food is not available during cold, winter months, many birds migrate south to forage in warmer climates.
The Refuge’s information sheet “Which birds may travel from the Arctic Refuge to or through your area?" shows that birds breeding on the Arctic Refuge have ranges that reach all 50 states.
Birds follow routes in all four flyways as they migrate between the Arctic Refuge and their southern wintering areas in these states.
arctic.fws.gov /birdmig.htm   (242 words)

  
 Bird ‘flu follows trade, not migration routes
The only wild birds found infected were victims of the virus circulating in domestic birds, such as sparrows, magpies, herons and birds of prey which scavenge around poultry farms.
The birds were mostly waterfowl, particularly swans, which had been pushed westwards by a spell of extreme cold weather in Eastern Europe, and the spread did not correspond to the usual routes or timing of migration.
And if migratory birds were a main agent of dispersal, then after July 2005 we might have expected massive die-offs of wild birds in the breeding areas and along migration routes, since bird populations would have been encountering the virus for the first time.
www.birdlife.org /news/news/2007/03/avian_flu_report.html   (1136 words)

  
 Bird Migration Notes: Mr and Mrs Smith's Life Science   (Site not responding. Last check: )
Birds may also calibrate their own direction senses to other cues like stars or magnetic compasses by noting where the sun is setting.
Birds are capable of using several cues to orient during migration, including the moon, the sun, stars, wind, magnetism, topography, and olfactory cues.
Birds may be able to tell that it is time to go by using changes in amount of light, temperature, or food.
hometown.aol.com /ksmith9526/BirdMigrationNotes.htm   (2220 words)

  
 WORLD MIGRATORY BIRD DAY - About Migratory Birds
Migration is a natural process, whereby different birds fly over distances of hundreds to thousands of kilometres in order to find the best ecological conditions and habitats for feeding, breeding and raising their young.
The social acceptance of birds as messengers of life was accompanied by the knowledge that migration had indeed an important role to play in ecosystem functioning.
World Migratory Bird Day with its global outreach is an effective tool for the international community to help raise awareness on the threats faced by migrating birds, their ecological importance and the need for international cooperation to conservation them.
www.worldmigratorybirdday.org /2007/index.php?option=com_content&task=view&id=13&Itemid=26   (875 words)

  
 TPWD: Bird Migration Frequently Asked Questions
Migration is the cyclic or periodic travel of an animal as it returns eventually to its original place of departure.
The birds developed a tendency to leave in spring to breed in territories to the north that were less crowded.
Migrations appear to be the consequences of invasions or emigrations during which animals settle in new regions during part of the annual cycle, then return to the original region to complete the cycle.
www.tpwd.state.tx.us /huntwild/wild/birding/migration/faq   (3693 words)

  
 What is Bird Migration
In birds migration is seasonal and often spectacular and much is now known about the physiology as well as the mechanics of migratory flight.
Birds such as ducks, geese, swans and quail were valuable food resources to early man. Their tendency to be plentiful at one part of the year and scarce or non-existent in another would have been noticed and recorded in tribal law.
The migration of birds is now a well known and accepted fact and we find it hard to understand how such fanciful ideas could ever have been believed.
www.earthlife.net /birds/migration1.html   (1549 words)

  
 Bird Migration
Watching bird migration take place is one of the most exciting and interesting things a birder can do, and it's something you can see in your own backyard.
Especially in the spring when birds are in their bright courtship plumage and males are lustily singing, it's a pure joy to walk around taking note of which species have arrived.
For that film they raised ducks, geese and other birds from the egg and trained them to allow themselves to be filmed from very close, as the birds were flying in a variety of beautiful locations.At the right you review and buy the film, and farther to the right, the book.
www.backyardnature.net /birdmgrt.htm   (1001 words)

  
 BBC - Science & Nature - Birds - Features - They're Off
Bird migration is the only mass animal movement that we can observe at first hand in the British Isles.
During autumn migration flocks of juveniles are commonplace in the British Isles whereas adults are decidedly scarce.
Migration at this season is a more relaxed affair and birds tend to wait for optimum weather conditions before starting a long flight.
www.bbc.co.uk /nature/animals/birds/weeklyfeature/theyreoff   (1139 words)

  
 Bird Migration (An Introduction)
Between 1500 and 4000 species of birds migrate, the exact answer is not really knowy yet and the experts differ as to their answers.
Birds that we see all year such as Robins and Starlings either leave or come to Britain during the winter.
Anyway, whatever the true nature of the migration observed the fact of migration itself is a fascinating and awe inspiring facet of bird ecology.
www.earthlife.net /birds/migration.html   (605 words)

  
 Bird Migration
Research on migrating birds in Israel, based on satellite and radar monitoring, makes it possible today to track the birds from Israel to their winter nesting grounds in Africa, and back northward, via Israel, to their summer nesting grounds in Europe.
At the The International Center for Study of Birds Migration, located on the main highway between Tel Aviv and Jerusalem, interdisciplinary and educational activity is being developed to permit computer tracking of migrating birds and exchange of information with ornithologists and students in neighboring countries.
Migrating birds do not recognize political borders, and serve as ideal symbols of the era of peace that is dawning in the Middle East.
www.jewishvirtuallibrary.org /jsource/Environment/birds.html   (251 words)

  
 BirdCast: What is Migration?
If it is spring or fall, the great pivot points of the year, then the continents are swarming with billions of traveling birds—a flood so great that even the most ignorant and unobservant notice, if nothing else, the skeins of geese and the flocks of robins.
Tiny song birds from Alaska leap west across the Bering Sea to the Philippines, and others from eastern Canada cross the North Atlantic to Europe and Central Africa.
Bird migration is the one truly unifying natural phenomenon in the world, stitching the continents together in a way that even the great weather systems, which roar out of the poles but fizzle at the equator, fail to do.
www.birdsource.org /BirdCast/what_is_migration.html   (777 words)

  
 birding facts Birding Resources by the Fat Birder
The Smithsonian Migratory Bird Center is dedicated to fostering greater understanding, appreciation, and protection of the grand phenomenon of bird migration...
Not only do BirdCast Web-watchers see radar imagery which depicts bird movements throughout peak migration periods, but they have the opportunity to help scientists better analyze what the radar images mean by reporting what they are seeing out in their yards, in parks, or at other favorite bird-watching spots...
Bird migration is one of the world`s most extraordinary wonders.
www.fatbirder.com /links/ornithology/migration.html   (1976 words)

  
 Bird Migration: Help Track Migratory Birds
Scientists have noted and studied the decline in the numbers of migratory bird species for several decades, and two likely reasons have emerged as the greatest threats to their survival: destruction of the tropical forests where many birds spend the winter, and disruption of their breeding and stopover habitats, especially coastal areas.
But short or long, the number of migratory birds making these treks is dwindling, and the numbers will continue to decline unless we learn more about their migratory habits and help ensure they have a healthy environment in which to breed and live.
The North American Migration Count uses volunteers to gather information on the progress of spring migration and on the numbers and distribution of various migratory birds.
www.charityguide.org /volunteer/vacation/bird-migration.htm   (727 words)

  
 Bird Migration
Songbirds disappear during migration for unknown causes; many species show negative populations trends
Conservation: establishment of stop-over reserves and migration corridors
Basic Science: solving orientation capacities of birds in the wild; potential to study dispersal of birds: "Where do the kids settle next year?"
www.princeton.edu /~tracking/ICARUS_website/MigrationPoster.htm   (164 words)

  
 [No title]
The laboratory is devoted to the acquisition and analysis of radar data as it relates to bird movements in the atmosphere.
We also are using these data to develop continent-wide and regional migration maps and to build predictive models of migration for different regions of the United States.
Conducting radar studies of bird migration through Panama.
virtual.clemson.edu /groups/birdrad   (194 words)

  
 Wild Birds Unlimited: Bird Migration
Bird Migration is a fascinating time for many bird watchers.
Unlike mammalian or reptilian lungs, the lungs of birds remain inflated at all times, with the air sacs acting as bellows to provide the lungs with a constant supply of fresh air.
For example, birds heading north are already constrained by the relatively short amount of time available to get to the breeding grounds, establish a territory, pair with a mate, and get on with the further demands of raising young.
www.wbu.com /edu/migr.htm   (1207 words)

  
 the mystery of bird migration: why and how?
Birds which breed in the summer in the extreme north such as the Arctic benefit from an abundance of food as plants and insect life flourish in the long daylight hours; and because few large permanent predators can survive the harsh winter.
While many birds migrate from northern breeding areas in the summer, to southern wintering grounds (mainly because there is more land near the northern pole than the southern), there are many other migration patterns.
Migrating birds are also distracted and killed by lit-up skyscrapers, lighthouses and other unnatural man-made formations that mislead them.
www.naturia.per.sg /buloh/birds/migration.htm   (931 words)

  
 Crane Migration - Operation Migration
That was five years after Bill became the first human to fly with birds, and one year after the two artists, turned biologists, used ultralight aircraft to lead a small flock of Canada geese from Ontario, Canada to Virginia, USA.
To perfect techniques, and ensure that once released, birds conditioned to follow their ultralights would remain wild, several migration studies were conducted with non-endangered Sandhill cranes in subsequent years.
Until Operation Migration was asked by the US Fish and Wildlife Service to spearhead a reintroduction of the world's most endangered cranes, there was no method of teaching migration to captive reared Whooping cranes released into the wild.
www.operationmigration.org   (331 words)

  
 BWB-ASF Library: Bird Migration Facts
Migration is the seasonal movement of birds, generally between breeding and non-breeding areas.
Many birds that breed in North America migrate to areas south of the Tropic of Cancer (southern Mexico, Central and South America and the Lesser and Greater Antilles in the Caribbean Sea) in the fall (August-October) because of a decrease in their food supply.
Some birds are short-distance migrants and migrate only as far as they need to find food such as insects, seeds and berries.
www.zoosociety.org /Conservation/BWB-ASF/Library/BirdMigrationFacts.php   (1249 words)

  
 eNature: Birds & Birding: Spring Migration
If you are familiar with the birds in your area you know that the change can be abrupt: One morning, the bushes and trees around you are suddenly filled with singing birds that were not there just the day before.
Many of the birds we consider "our birds," those that appear in field guides to the United States, actually spend less than half of their lives here.
In recent years, much research has focused on the lives these birds lead during their stay to the south, looking at how they interact with nonmigratory resident species and how the habitat changes taking place in southern forests might affect the migrants.
www.enature.com /birding/migration_home.asp   (635 words)

  
 Bird Migration - Why, How, When, and Where
Learn why birds migrate, their patterns of migration, and the mechanics of migration.
Animated graphic shows how birds that migrate at night will time their daily exodus.
Includes facts about the evolution of migration, stimulus for migration, when birds migrate, flight speed and altitude, navigation, influence of weather, and the routes of migration.
www.closertonature.com /outdoors/bird-migration.htm   (217 words)

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