As I member of the Board of Directors for Audubon Minnesota, I was part of the conservation organization putting up the biggest fight 2 years ago, to convince the Minnesota Vikings to substitute "bird-friendly glass" in their stadium construction. It was basically the Vikings' owner who still refused to do this, even though he had a budget of an *extra* $20 million to cover unexpected construction costs (bird-friendly glass would have used only about 4% of those extra available dollars). So a movement of local volunteers was started to collect collision-killed birds around the stadium, and this article reveals some preliminary findings from this past fall (with a full report to come out in about 2 years).
Iowans need to be aware of a newly-planned, mostly glass-walled skyscraper for downtown Des Moines. The nearby Des Moines River is a major bird migration pathway through central Iowa, so unless bird-friendly glass in incorporated into the 33-storey design, we may realize something similar to the situation in Minneapolis.