So, the Wikipedia article on DDT has like 6 different citations/links on DDT and egg shell thinning in birds of prey: https://en.wikipedia.org/wiki/Dichlorodip

So, the Wikipedia article on DDT has like 6 different citations/links on DDT and egg shell thinning in birds of prey: https://en.wikipedia.org/wiki/Dichlorodiphenyltrichloroethane#Eggshell_thinning https://en.wikipedia.org/wiki/Dichlorodiphenyltrichloroethan... http://www.tandfonline.com/doi/full/10.1080/232 http://www.tandfonline.com/doi/full/10.1080/232 http://onlinelibrary.wiley.com/doi/10.1046/j.1474-919X.2003.00132.x/abstract;jsessionid=D3AD173B0F28B5C597A507162C401F97.f02t0173747.2016.1173766 http://onlinelibrary.wiley.com/doi/10.1046/j.1474-919X.2003.... Many are behind a paywall but here are some with abstracts we can read: http://www.sciencedirect.com/science/article/pii/S0742841397001059?via%3Dihub http://www.sciencedirect.com/science/article/pii/S0742841397... http://www.tandfonline.com/doi/full/10.1080/23273747.2016.1173766 http://www.tandfonline.com/doi/full/10.1080/23273747.2016.11... Also, there may well be a valid debate about when or when not to use DDT, but the link you cite does not inspire confidence.