It wasn't just Eagles, it was any birds that ingested it in water or anything else but the real culprit was a compound, due to the loss of Hydrogen Chloride from DDT, that made the eggs thin. California Condors almost became extinct because of it and now, that handsome raptor's numbers have risen to almost 400 birds. They were extinct in the wild and only 27 birds were alive in captivity. It was pretty damn cool to see them soaring while I hiked in and out of the Grand Canyon.