The Conversation?

" 2009 study using US and European data on bird deaths
estimated the number of birds killed per unit of power generated by wind, fossil fuel and nuclear power systems."
But let's actually look at a study.
"In making this case, a number of salient limitations deserve mentioning. This study compares wind energy with nuclear power and fossil fuels but not other sources of electricity such as solar panels or hydroelectric dams.
Many of the avian deaths from fossil fuels result indirectly from climate change, whereas those from wind energy and nuclear power are more direct from collisions with equipment (wind turbines and nuclear cooling towers) and contamination of land and water (uranium mines and enrichment facilities). "
https://www.tandfonline.com/doi/full/10.1080/1943815X.2012.746993Climate change kills birds because they can't move.

BTW- The study referred to by TC is entitles - "Contextualizing avian mortality: A
preliminary appraisal of bird and bat fatalities from wind, fossil-fuel, and nuclear electricity"
With the usual plea for more money.