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
Ecological research methods to study bird migration include bird banding to track individual birds, using GPS or radio telemetry to monitor movements, conducting radar studies to observe large-scale migration patterns, and analyzing stable isotope signatures in feathers to determine breeding and wintering locations. Integrating multiple methods can provide a comprehensive understanding of bird migration behaviors.