A new study, "Canadian Estimate of Bird Mortality Due to Collisions and Direct Habitat Loss Associated with Wind Turbine Developments” came out earlier this month. Its conclusion should be entirely unsurprising: on average a Canadian turbine will kill about 8.2 birds per year, or about 23,200 in total. That's a largish sounding number, but its trivial when compared to the 100 and 350 million birds killed by feral/house-cats every year, or the 25 million killed by colliding with Canadian windows. Or, really compared to any major source of bird mortality you can name. Which is why anti-wind forces have essentially struck out when playing the "bird blender" card before the ERT (Ontario Environmental Review Tribunal). See, for example, here.