this is the ppt made on english chapter migration class 6

2. HOW DO BIRDS MIGRATE
Bird migration is the regular seasonal movement.
Often north to south along a flyway between breeding and wintering grounds.
Many speices of birds migrate.
It occurs mainly in northen hemisphere
Migration carry high cost in predation and mortality , include from hunting by humans .
By Saanvi Fulara

3. BIRDS MIGRATION
Birds migratte to move from Areas of low or decreasing resources to areas of high or increasing
resources.
The two primary rwsources being sought food and nesting locations.
As winter approaches and the availibility of insects and other food drops.
Birds move south .
By Saanvi Fulara

4. how does the weather affect bird migration?
qOne of the major effects of climate change is loss of habitats.
The habitats migratory birds depend on are in danger to change and to disappear due
to increase temperatures, flooding or desertification.
Costal wetland areas that migrating birds use for nesting and foraging are an
example.
During their migration , birds rely on these areas to provide food and resting places.

5. WEATHER AFFECT BIRDS
There they can refuel and response before continuing there long journeys.
Rising sea levels due to climate change cause the flooding of these habitats and
they are lost for birds and other animals.
Without these stop – over places, the birds have insufficient reserves to continue
and have difficulties completing their journeys.
The loss of habitats continues through increasing desertification for example of
the Sahel region.

6. Birds
Increasing populations lead to a demand for more land to grow crops and
graze animals and to the intensified use of land.
This contributes to further land degradation and leads to expansion of
deserted areas.
Climate change worsens the effect by a decrease in rainfall in Sahel
region.
As a consequence of the dryness, the desert expands further.