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© Hanne & Jens Eriksen/VIREO
Gyrfalcon travels south from normal Arctic range

The largest of the falcons, a rare gyrfalcon, was seen in Madbury during the past week, according to the Audubon Society's rare bird alert.

Fast like a peregrine falcon and wearing a faint mustache, gyrfalcons live in the Arctic.

According to the Peregrine Fund, the birds of prey are very sensitive to changes in the environment.

The group said pesticides, loss of habitat or a decrease in prey can affect populations of gyrfalcons.