The myth about the bird eggs becoming thinner around DDT was disproved.
I won’t argue but what happened to the eagles and the hawks? I could see that it might have disrupted the food chain or something but birds of prey were almost non-existent for many years. I don’t remember other birds being in short supply but definitely hawks and eagles.
I’ve wondered if this reflected a smaller number of bugs available for the birds’ diet, meaning that the DDT did what it was intended to do, but unfortunately this side effect also starved the birds of calcium.