“Bald eagles between 1941 and 1960 migrating over Hawk Mountain, Pennsylvania, doubled during the first six years of DDT-use. Their numbers increased from 9,291 in 1946 — before much DDT was used — to 16,163 in 1963 and 19,765 in 1968.”
” Scientists tested the popular shell-thinning hypothesis. U.S. Fish and Wildlife Service biologists fed birds for 112 days on a diet with 100 times as much DDT as they were getting from the environment. No thinning of egg shells was found. The DDT had no effect on the birds.”
“One experimenter, to demonstrate eggshell-thinning, fed quail a diet with DDT but containing only one-fifth of the normal amount of calcium. His experiment succeeded in producing thinner eggshells, but his deception was exposed. “
I would NEVER EVER trust ANYthing that comes from the US Fish Wildlife commissions. They make up stats all the time to suit their needs! They’re as bad the Bird brain people....that Audobon Society.