Apparently, birds are migrating and fly into these windmills or are getting whacked by the propellers. I found it on this site while I was doing a project for my tec. class. Hope this helps.
http://online.wsj.com/article/SB10001424052970203706604574376543308399048.html
As humans populate formerly wild regions, they increasingly intersect bird migration patterns.Scientists have finally located the 24-hour clock that guides the migration of monarch butterflies.It's a reference to the average miles food travels to your plate and the gallons of fuel used in its migration.
yes every bird survives migration unless they are deadly sick or unwell and there health is good or great they will survive migration
He has studied the migration patterns of several bird species for eight years.
Migration
Phenology
it isn't
what was the effect of the migration of liberal spaniards on the life of jose rizal
The movement of humans into a population is called migration.
explain the effect of net migration on a country's production possibilites frontier
migration
because of food sacurity
Migration patterns are patterns of migration.. such as if a bird migrates to a warm climate region in the winter then to a cool climate in the summer they will most probably repeat this yearly... thus making it a migration pattern.