The peregrine falcon is the best known falcon and most widespread in the world. However if you travel to North Dakota, you won’t see many and you will not find any at all in Antarctica.
This falcon was on the endangered species list back in 1970 because of a problem with egg shell thinning that was caused mainly by use of the pesticide DDT during the 1950s and 60s. It took biologists 20 years to figure out that the pesticide used to protect plants from insects was the problem affecting these birds and other animals. Small animals ate the plants contaminated with the pesticide, and when the peregrine falcon hunted those animals, the infected flesh poisoned them. The chemical even changed the behavior of peregrine falcons in that it made them stop caring for their young.
The federal government banned the use of DDT in the United States; however, the recovery process took a while because the chemical residue remained in the environment. Other countries which are home to peregrine falcons still use DDT, and that, along with trapping and shooting by poachers, still cause the bird’s population to decrease. Today the endangered list still includes...
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