I wonder how many birds DDT killed?
none
Not many. The possible main victims of DDT were eagles in thinned eggs but DDT was not shown to be a major killing of wildlife. Rachel Carson used bad science and possibly fraudulent science to write “Silent Spring”.
DDT has been used on humans since at least WW2, esp. in malaria/mosquito ridden areas like Sicily and No. Africa. Tens of millions of humans have died from malaria because of the non-use of DDT.
There are trade-offs in life.
I can’t find a strong enough mosquito spray to kill some really nasty critters in my yard. I spray them and, like Bobcat Goldwaithe in “Police Academy”, they use it as a mouthwash.
I kill more mosquitoes by hitting them with a can then I do with the actual spray. (RAID, fair. The other one, Red can - not so good. Natural Bat - really good; manmade bat - awesome.)