Peregrine Falcon Present all year. Traditionally nests on crags, but will nest in trees. It is a much persecuted species that has made a dramatic comeback in recent years. Birds were shot during World War II to prevent them from preying on carrier pigeons that were used to carry important messages. Increased use of pesticides containing DDT and Dieldrin during the 1950s and 60s produced an all time low population, with birds laying eggs with shells that were too thin to be of any use. It is still a persecuted species despite the protection afforded to it by the Wildlife and Countryside Act 1981, as one of it's main food sources is the pigeon, wild or otherwise. Fastest falcon that can reach speeds of up to 120 mph in a stoop after prey. Three pairs nest on the reserve, and in recent years one pair has attempted to breed on the masonry dam in a purpose built nestbox.