They stop on the Texas Coast to feed before continuing their migration. During the mid-1900's a chemical pesticide called DDT was widely used to prevent insect damage to crops. DDT worked its way up the food chain when poisoned insects were eaten by smaller birds that were then eaten by larger birds including peregrine falcons. The DDT built up in the fat tissues of the falcons. This caused the falcon eggshells to be so thin that they would break when the adults would try to incubate them.
Peregrines eat birds and other things that fly.
While peregrines can be observed in many areas during migration, they aren t common visitors to backyards. However, Cooper s hawks, sharp-shinned hawks and American kestrels all eat birds and are somewhat similar in appearance to peregrines and can routinely be observed in residential areas. There are thousands of bird-related sites, and finding the best ones can be very time consuming. Listed below are some of the most interesting sites we have come across. We've tried to categorize links as much as possible, and listed them alphabetically within each area to make them easy to find.