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my question is that--------Writing an article.
Write an article on any one of these topics.
The topics given are broad in nature.Do some research on your chosen topic and focus on a few aspects when you write your article.
1. Migration of birds during winter
2. Venoms of various insects/ reptiles/ arachnids
Answers
Answer:
Explanation:Birds have been known since time immemorial to be migrating from one region to another. The birds can be local migrants, short distance migrants, long distance migrants and nomadic and vagrant migrants. They do travel across national and international borders. The migration is always due to the instinct for survival. This instinct leads birds to look for seasonal opportunities for food supply and breeding habitats. The findings from the studies conducted on the concept of bird migration reveal that millions of birds migrate annually from unfavorable to favorable conditions (Hubalek, 1994, 2004). Unfavorable conditions are usually in winter while the favorable are in summer. Birds therefore migrate from places where there is winter to places with seasons of winter. This explains why the migration is rampant.
The environmental conditions during summer accelerate food accumulation and breeding because of the better climatic conditions. Through biological systems, birds store up energy and fats during this season. The energy and fats stored aid in migration when there are changing survival conditions in the habitat. During this period, winter falls. An interesting observation is that not all birds migrate with the changing conditions. The pattern of migration differs with species and requirements (Berthold & Peter, 2001). Some birds do migrate over short distance just to look for food and come back. Others migrate over long distance and may come back or not.
The migration of these birds is a natural phenomenon. They have to do that in order to maintain ecological balance and most importantly, to survive. However, the natural phenomenon is always followed by harsh repercussions that are unavoidable. It is saddening to know that these birds are either carriers or hosts for pathogens. As they migrate, these birds transfer micro-organisms across localities, nations and even continents. They therefore play a significant role in the ecology and pathogenic organism circulation. These birds are implicated as hosts and mechanical carriers of infected ecto-parasites. They are also implicated in the transmission of zoonoses. It is not possible to put a stop to this sequence but we can minimize the risks involved. This can be done by controlling and preventing perilous situations.
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ARTICLE ON --- MIGRATION OF BIRDS DURING WINTER
Bird migration is the regular seasonal movement, often north and south along a flyway, between breeding and wintering grounds. Many species of bird migrate. Migration carries high costs in predation and mortality, including from hunting by humans, and is driven primarily by availability of food. It occurs mainly in the northern hemisphere, where birds are funneled on to specific routes by natural barriers such as the Mediterranean Sea or the Caribbean Sea.
Migration of species such as storks, turtle doves, and swallows was recorded as many as 3,000 years ago by Ancient Greek authors, including Homer and Aristotle, and in the Book of Job. More recently, Johannes Leche began recording dates of arrivals of spring migrants in Finland in 1749, and modern scientific studies have used techniques including bird ringing and satellite tracking to trace migrants. Threats to migratory birds have grown with habitat destruction especially of stopover and wintering sites, as well as structures such as power lines and wind farms.
The Arctic tern holds the long-distance migration record for birds, travelling between Arctic breeding grounds and the Antarctic each year. Some species of tubenoses (Procellariiformes) such as albatrosses circle the earth, flying over the southern oceans, while others such as Manx shearwaters migrate 14,000 km (8,700 mi) between their northern breeding grounds and the southern ocean. Shorter migrations are common, including altitudinal migrations on mountains such as the Andes and Himalayas.
The timing of migration seems to be controlled primarily by changes in day length. Migrating birds navigate using celestial cues from the sun and stars, the earth's magnetic field, and mental maps.