Why did herons die from DDT?

DDT caused thinning and weakening of eggshells in reproductive female birds, such as herons. It also affected their feeding and motor coordination behaviors, making them more susceptible to predators and environmental hazards.

What to do if parrot has lice?
Why did my parakeet die It was perfectly fine the night before The next day he weak and dying He died in hands If whoever answers this needs more info please just say?