Okoniewski, J.C. 1980. Vocal response of eastern coyotes to an electronic siren and human howling. M.S. Thesis, SUNY-ESF, Syracuse, 47 pp.

Abstract: The vocal responsiveness of 14 radio-telemetered eastern coyotes (Canis latrans var.) to an electronic siren and human howling was measured in the Adirondack Mountains of New York from August 1978 to mid-October 1979. Thirty-nine of 158 total trials had response for an overall response rate (RR) of 25%. Both stimuli were similar in effectiveness. Subadult coyotes (average RR = 1%) were significantly (p < 0.05) less responsive than either adults (36%) or pups (34%). Seasonal peaks in family group response were observed late in the breeding season and during mid-to-late summer near rendezvous sites. Little response was obtained early in the breeding season or during the denning period. No relationship was found between response and the following factors: activity (determined by telemetry), distance-to-coyote and total barometric pressure change. No evidence of habituation to the stimuli was observed with a sampling schedule that averaged 1 trial/week/coyote. Guidelines for a summer census of family groups are outlined.

During collection of data for this project, a telemetered adult male coyote was killed in an encounter with 3 other coyotes (one telemetered) in the spring of 1979. the location of the incident was within the normal range of the dead coyote, but outside of that normally used by the telemetered adult female in the group of 3. the adult female was near whelping on the date of the encounter. It was not possible to determine the sequence of events which immediately preceded this incident.