Quote Originally Posted by rnclark View Post
I went to this report.
Assuming 1000 towers, that works out to about 10.5 birds per tower per year assuming all the birds were killed by towers.

And if the bird population in the US is ~5 billion, over 50 years, its a pretty small mortality rate.
But if you look at the whole picture where there are probably many 100,000's of towers in the USA then 10.5 birds per year starts to become a fairly large number. But I whole heartily agree that the numbers they give are basically useless.

One place where I am very sure that tagging has been very useful is with the California Condor program.

Bill