4. What is the scientific reason behind bird's migration? (AS 1)
Answers
THE SCIENTIFIC REASON BEHIND MIGRATION OF BIRDS ARE THAT THEY CANNOT CHANGE THEIR TEMPERATURE ALONG WITH OUTSIDE TEMPERATURE AND WITH THE CHANGE IN OUTSIDE TEMPERATURE, THEIR BODY TEMPERATURE FLUCTUATE. HENCE , TO PROTECT THEMSELVES FROM SUCH HARSH SUMMER OR WINTER CONDITIONS, THEY GO FOR MIGRATION.
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Explanation:
Following are several reasons behind birds migration:
1. If No Birds Migrated
Without a reason to migrate, birds would have even more challenging lives than making these excruciating journeys. If no birds migrated, food supplies in their ranges would be rapidly depleted during the nesting season, and many chicks and adults would starve.
2. Migrating for a Meal
For all birds, one of the principle driving forces behind migration is food scarcity. If all birds were to stay in the same tropical regions year-round, food would become scarce and breeding would be less successful.
3. Migrating for Family
Over millennia, birds have evolved different migration patterns, timing and destinations to disperse around the world to breed. This helps birds take advantage of a wide variety of suitable conditions to raise their young, increasing the chances of healthy, viable offspring.
4. More Reasons Birds Migrate
(a) Climate: Birds have evolved different types of plumage to survive different climates, and changes in those climates can affect migration.
(b) Predators: Habitats that have abundant food sources year-round also attract a greater number of predators that can threaten nests. Birds that migrate to different habitats can avoid that onslaught of predators, giving their young a better chance of reaching maturity.
(c) Disease: Any large group of birds crammed in one type of habitat is susceptible to parasites and diseases that can decimate thousands of birds in a short period of time.
In the end, the reasons why birds migrate all come down to survival – not just the survival of the migrating birds themselves, but also the survival of the chicks they will raise. Finding richer food sources, seeking safer habitats and avoiding predators are all migration behaviors designed to ensure breeding success. Good migration allows birds to survive for another generation and allows birders the pleasure of witnessing another year’s migration.