Hi Guys,
Yesterday morning, I saw a few
migratory birds flying over my head. It has been quite some time since I saw
them. As soon as I saw them, my mind became so happy. It was then that I
realized how much I missed watching these birds. I am not a keen bird watcher,
but I enjoy seeing the flock of birds, their amazing pattern and the sheer
strength displayed.
The great evolutionist Charles
Darwin said that only the fittest will survive. The migration of the birds can
be attributed to their survival. It is etched in their genes that they must
travel in order to survive. I wonder how the evolution must have taken place.
Identifying a place where they can be safe and travelling back and forth every
year.
Many of the birds travel more
than 10000 miles each year with the hope of surviving and creating their
successors. The whole story is that they need to travel back another 10000
miles again. This process continues.
Over the time they have evolved
in such a way the birds know exactly what they are doing in migration. Before
the migration period they start conserving energy and store the food as Fat in
their body. Some species of birds don’t stop in between during the migration. A
bird species in New Zealand migrates to the northern Hemisphere without
anywhere in between. They cover a distance of more than 6000 miles.
Most of the birds travel in a
particular route all the time. These routes are genetically imprinted in the
birds. They travel along a particular mountain range, coast or any other easily
identifiable landmark. Most of these routes are designed in such a way that
they consume less energy. Mostly we can see that their destination also remains
the same. A particular butterfly in Northern America migrates from Mexico to
USA and back to Mexico in a circular pattern. By the time, they complete a
journey three generation of butterflies’ passes away. It is genetically
programmed in such a way that when a newer set of butterflies come into life,
they know exactly where to go.
Also, you must have seen the
birds travelling in flocks. Most of the time they are V shaped in nature. This
reduces the total energy spent by the birds in order to fly. The bird at the
head directly counters the wind and it deflects the wind and the pattern is in
such a way that the other birds are not affected by wind. After sometime, the
head bird is replaced by some other bird. It is said that this process
conserves around 15% of the energy. It increases the speed of the birds by
around 3 miles/hour.
It is just mindboggling to know
the amount of energy the birds spent in order to survive and pass on their
genes. As I write this article, there must thousands of birds flying all around
the world migrating from one place to another with the hope of surviving. At
the end of the day, it is the ‘Survival
of the Fittest’ and these birds are born to survive.
Happy Reading!!!