(1) Ranging from creamy pink to pale yellow, peregrine falcon and gyrfalcon eggs are slightly smaller than chicken's eggs, but many times more valuable.(2) Its cliffs and valleys are habitat for peregrine falcons and endangered gyrfalcon , while its tidal flats and river mouths attract huge numbers of migrating birds and waterfowl.(3) They've both become superb birders, too, able to distinguish in a wing beat, for example, a gyrfalcon from a peregrine falcon during a brief aerial tussle.(4) Detecting prey from fir away is an essential element in the unique hunting strategy of gyrfalcons .(5) Adam and his team of falconers use predatory birds like gyrfalcons , eagles, and peregrine falcons to clear the air.