> 1.  It was killing raptors and  caused egg shell thinning in birds.  The
> administrative law judge in charge of the hearings to ban DDT concluded
> this was totally false as the Audobon Society data showed most raptor
> population hit minimum either before or at the start of public use of DDT
> and most were recovering nicely by the time of the hearings.  In addition
> feeding tests done by USDA on both raptors and ducks after the ban showed
> no bird or egg shell issues even at doses far higher then those in the
> environment.


But then- "In the 1960s, the naturalist Derek Ratcliffe compared peregrine
falcon eggs from historical collections with more recent egg-shell samples,
and was able to demonstrate a decline in shell thickness.[3] This was found
to cause the link between the use by farmers of pesticides such as DDT and
dieldrin, and the decline of British populations of birds of prey."

https://en.wikipedia.org/wiki/Oology

Geoff Manning

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