Migratory birds are those that fly out to different parts of the world in the winter to escape the cold. The Siberian Crane and Flamingoes are examples of migratory birds that flock to India during the winter.Perhaps the most obvious is that migratory birds are able to fly long distances. They have strong wings that allow them to fly for hours or even days at a time. Migratory birds also tend to be larger than other types of birds.Migratory birds help in dispersal of seeds, leading to maintenance of biodiversity along their routes. Ducks can transport fish eggs in their guts to new water bodies. The droppings of birds, also known as guano, are rich in nitrogen and act as organic fertilizers.Pelicans, storks, birds of prey, swifts, swallows, and finches are diurnal (daytime) migrants. Waterbirds, cuckoos, flycatchers, thrushes, warblers, orioles, and buntings are mostly nocturnal (nighttime) migrants.
What are 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. For instance, when the conditions in the breeding grounds become very difficult due to low temperatures migratory birds fly to regions where conditions are better. There are many different migration patterns. Most birds migrate from northern breeding areas in the summer, to southern wintering grounds. However, some birds breed in the far south of Africa, and migrate to northern wintering grounds, or horizontally, to enjoy the milder coastal climates in winter. Other birds migrate in terms of altitude, moving higher up a mountain in summer, and wintering on the lowlands.
Migratory birds have the perfect morphology and physiology to fly fast and over long distances. However, they often experience an exhausting journey during which they go to their limits. The Red Knot e.g., a 24 cm long wader with a weight of around 220 g, breeds in Siberia and overwinters on the African West coast, some of its species even going down to South Africa. During its migration it loses nearly half of its body weight. Migratory birds therefore rarely fly to their destination non-stop but interrupt their journey frequently to rest and feed, or to sit out a spell of bad weather. How migrating birds exactly find their flyways is not fully understood. Newest experiments indicate that they are orientating along the Earth's magnetic field with special light receptors in their eyes.
The symbolic meaning of birds and their journeys:
Humans have always been fascinated and inspired by the phenomenon of bird migration. In ancient Greece the bird of Athena represented the renewal of life. A dove, with an olive branch in its beak, returned to Noah's ark to announce the end of the deadly flood. The dove remained a symbol of peace and hope. During the era of the Pharoas in Egypt, the falcon had protective powers and was linked to royalty. For the Native Americans birds had different meanings, always positive and linked to the concepts of unity, freedom, community, safe return, love and celebration of life.
In dreams birds embody fantasy, ideas and thoughts. The image of a flying bird is immediately connected with lightness and freedom and hence the expression “to be free as a bird”. Many people associate flocks of migrating birds in the typical V-like alignment with the change of season, but also with perfection, beauty and harmony. Until the 18th century people believed that swallows sank in mires at the beginning of autumn and appeared again as amphibians in the following spring. And still today some parents mark their houses with painted storks to indicate that a new baby has been born.
In almost all cultures, for centuries flocks of birds have announced the arrival of spring, and the yearly rebirth of nature associated with it. 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.
Why migratory birds need to be protected?
Many bird species migrate in order to survive. However, migration is a perilous journey, presenting a wide range of threats. Only a small number of birds are actually threatened by natural events. Sad but true, human activities are the source for most dangers migrating birds are exposed to. And as diverse as people and their habits in different countries are, so are threats the birds face. The loss of habitats due to pollution or exploitation caused by encroachment for settlement, agriculture, grazing e.g. is the main threat to migrating birds, which are dependent on finding suitable breeding and wintering grounds as well as stopover sites along their flyways where they can rest and breed. The loss of any of these sites used by the birds during their annual cycle could have a dramatic impact on the birds’ chances of survival. Also high-voltage power lines and wind turbines have a dramatic impact on birds, which are in danger of being killed by electrocution or collision. Poaching remains a widely diffused practice in countries where people are highly dependent on biodiversity for their livelihoods. These are only a few examples and often a clear decrease of population within a species is the result of a combination of such factors and therefore hard to identify.
At the same time, flying over long distances means crossing many international borders and entering different political areas with their own environmental politics, legislation and conservation measures. It is clear that international cooperation between governments, NGOs and other stakeholders is needed along the whole flyway of a species in order to share knowledge and to coordinate conservation efforts.
Without cooperation all measures taken to tackle the threats for migratory birds in one country could be in vain if e.g. unsustainable taking is accepted in another country. The necessary legal framework and coordinative instruments for such international cooperation is provided by international agreements such as CMS and AEWA. 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.
Authorities have confirmed the presence of a migratory bird for the first time inside the Periyar Tiger Reserve (PTR). The fourth bird survey held at the PTR has spotted 231 bird species in total, including 14 threatened and 20 endemic species.
The four-day survey began on January 26 and was conducted jointly by bird watchers and the Forest Department.
P.O. Nameer, Professor and Head of the Center for Wildlife Studies, College of Forestry, Kerala Agricultural University, said that for the first time, the Kashmir flycatcher, a migratory bird, has spotted in the survey at the PTR. "The Kashmir flycatcher is an insectivorous species that breeds in the northwest Himalayas. In the survey, the Orange-breasted green pigeon was also spotted at the PTR after a gap of 100 years", said Dr. Nameer.
According to officials, some of the major bird species spotted in the survey include the Nilgiri wood pigeon, Chestnut winged cuckoo, Large hawk-cuckoo, Malayan night heron.
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