The first migrating birds
are small birds who cross the Sahara to winter in Africa.
They avoid the dry east of Spain and prefer to go through the
wetter northwest. One group goes down at the Portuguese
coastline and finally cross the Atlantic to Morocco. Another
group can be found at the eastern side of this route and cross
Gibraltar or better the strait near Tarrifa to arrive in Morocco and go on
through the Sahara desert to reach the rich tropical grounds of
Africa.
This first wave is
followed by a later one whose birds winter in Morocco and Spain
itself, and concentrate along the Mediterranean coast. They
arrive in October November.
The small birds are the
first ones who leave and cross Spain back to their breeding
grounds. In March the African migrants start their
journey back. Arriving in Spain in April/ May they need some time
to refill their energy after the exhausting crossing of the
Sahara. With bad weather lots of birds are stranded on the western Mediterranean
coast and the strait. They go northwards taking
a north-eastern route instead of the western route they came
down
with.