The methodologies described in the article seem sound to layperson like me, but do keep the last paragraph in mind:

> The study was funded in part by The Urban Wildlands Group, Environment Canada, the American Bird Conservancy and Defenders of Wildlife.

I wonder, for instance, how many total birds migrate each year and if we think communication towers are depleting those numbers. Don't get me wrong, I support common sense solutions to reducing needless bird deaths, but I also like to have context to know how much to worry about things.