I think that I provided enough citations for a reasonable person....or do you not believe US Fish and Wildlife, Stanford University, and National Geographic? All trustworthy sources....
1. For some reason your links are not clickable.
2. It's not DDT per se that is thought to do the damage to eggshells, but a DDT metabolite known as DDE. Thus the most persuasive feeding study refers to it: "DDE-induced Eggshell Thinning in the American kestrel: A Comparison of the Field Situation and Laboratory Results." This groundbreaking study was published in the Journal of Applied Ecology by Jeffrey Lincer in 1975.
3. Lincer noted that the "inverse correlation between DDE in North American raptor eggs and eggshell thickness is clear but does not prove a causal relationship since other chemicals or factors could be involved." So to find out what effect DDE might have, Lincer fed captive kestrels a DDE-laced diet and then compared their eggs with those taken from the nests of wild kestrels. Lincer found that dietary levels of three, six, and 10 parts per million (ppm) of DDE resulted in eggshells that were 14 percent, 17.4 percent, and 21.7 percent thinner respectively. "Despite the recent controversy, there can be little doubt now as to the causal relationship between the global contaminant DDE and the observed eggshell thinning and the consequent population declines in several birds of prey," concluded Lincer.
4. Despite considerable research, no one has ever identified the physiological mechanism(s) by which DDE causes eggshell thinning, according to AndersonÂ….In 1998, Royal Society for the Protection of Birds researcher Rhys Green published a study in the Proceedings of the Royal Society Bwhich found that eggshell thinning of some bird species had begun 50 years before the introduction of DDTÂ…..science shows pretty conclusively that it's another story for raptors.
That would be your eagles. So...while not provable....the evidence suggests that particular birds....eagles....are sensitive to DDE.
DDT, Eggshells, and Me - Reason.com
5. A note about trustworthy sources such as US Fish and Wildlife.....
“Ron Arnold, a former executive director of the Sierra Club and founder of the unfairly maligned ‘Wise Use’ movement, has spent the last twenty years researching the
cooperation among foundations, ENGOs, individual activists, and activist federal employeesÂ….Arnold proves that
thousands of activist members of advocacy groups are employed by federal agencies in positions that give them opportunity to exercise agenda-driven “undue influence” over goods-production decisions applied in rural areas. Put plainly, by the early 1990s, according to Arnold, the federal agencies- the Forest Service,
the Fish and Wildlife Service, the Bureau of Land Management- and many equivalent state agencies were riddled with activists.”
Nickson, "Eco-Fascists", p.164.
6. And one more note:
Let's acknowledge a deleterious effect of DDT on raptors. The ban in the United States was the result of the defeat of malaria....not the effect on eagles.
If we had deaths due to malaria here, I'm sure you would see the eagle-effect as necessary.
So....
"In Silent Spring, Rachel Carson asked, "Who has decided—who has the right to decide—for the countless legions of people who were not consulted that the supreme value is a world without insects, even though it be also a sterile world ungraced by the curving wing of a bird in flight? The decision is that of the authoritarian temporarily entrusted with power."
Banning DDT saved thousands of raptors over the past 30 years, but outright bans and misguided fears about the pesticide cost the lives of millions of people who died of insect-borne diseases like malaria. The 500 million people who come down with malaria every year might well wonder what authoritarian made that decision."
DDT, Eggshells, and Me - Reason.com