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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
As Weckstein explains it, there were virtually no falcons or hawks in Philadelphia a few decades ago thanks to DDT, that nasty insecticide that caused so many problems in the world.
Source: https://www.phillymag.com/news/2023/01/17/pigeons-philadelphia-birds/