Field Techniques in a Study of the Behavior of Peregrine Falcons
ABSTRACT
This discussion outlines techniques and philosophies used in a behavioral study of resident coastal Peale's Peregrines on the Queen Charlotte Islands, British Columbia. The principal aim of the study was to produce a qualitative and quantitative description of Peregrine breeding behavior (February through September). Such information will be applicable to problems in falcon management, biocide contamination, and captive breeding. Naturalistic observations formed the basis of the study, i.e. no experimentation or manipulation was undertaken.
Methods included observing from a distance and from blinds. With caution, over a period of time, it is usually possible to habituate falcons to accept an observer in full view within 100 to 200 m of the nest cliff. At this distance fruitful observations are possible. Habituated falcons appear to treat the observer much like a deer, sealion, or other animal. Satisfactory blinds can be constructed of canvas and PVC, natural and beachcombed poles, wire, and staples, with camera and telescope slits, and one-way glass windows. Disturbance to the falcons has been minimal with these methods.
Data recording was largely in detailed diary form, although this method is time-consuming in the analysis phase. In the field, however, when combined with tape recorded dictation of very rapid sequences, diary notes are satisfactory. 35 mm still and 16 mm movie cameras also provide useful information by preserving fleeting behavior postures and by allowing subsequent frame-by-frame analysis. Similarly, tape recordings of calls yield useful information.
Some special equipment, techniques, and problems are described, and some results illustrated.
