Bird Migration: Sinhagad College of Arts Commerce and Science
Bird Migration: Sinhagad College of Arts Commerce and Science
Bird Migration: Sinhagad College of Arts Commerce and Science
BIRD MIGRATION
There are nearly 9000 kinds of birds in the world. They are of different colours,
shapes and sizes and they eat different sorts of food.
Bird
“Migration is migration
the seasonal
movements between a breeding
location and a location where it
survives when not breeding”
These movements are usually
irregular or in only one
direction and are termed
variously as nomadism,
invasions, dispersal or
irruptions. Migration is marked
by its annual seasonality.
Why do birds Migrate?
The changing seasons can transform a comfortable environment of a bird into
an unlivable one -- the food and water supply can dwindle or disappear, plant
cover can vanish, and competition with other animals can increase.
Transients: Migratory species who nest farther north than our neighborhoods,
but who winter farther south; they are "just passing through."
Birds Migrating in Flocks or Alone
Some species of birds are highly social during
migration, moving in flocks.
Northern Pintail
On the basis of distance migrations are
again of two types: Long-distance migration
Sun Compass
Star Compass
Odor Map
Magnetic Map
Magnetic Compass
Waterfowl (Snow Geese ) Migration
It nest in high arctic regions from the North Slope of Alaska, eastward along the
coast of northwestern Greenland, and southward along the western and southern
shores of Hudson Bay.
They migrate southward during the fall in large flocks, flying both day and night at
high altitudes.
The time of their flight is dependent upon weather. When conditions are right they
can cover many hundreds of miles during a single high-altitude flight.
It is a round trip of
some 25,000 miles
performed every
year of the birds life.
Shorebird Migration
Shorebirds, nest on the arctic tundra and migrate to southern wintering grounds.