"Sacks et al. (1999) found that breeding pairs (especially males) with territories overlapping sheep were responsible for most kills."(940)

"Several factors associated with breeding status likely affect vulnerability to removal. First, breeders tend to be older individuals…. Second, in contrast to nonbreeders, which are often transient, breeders are obligatorily territorial (Messier and Barrette 1982, Sacks et al. 1999)"(940)

"Cores were defined as the area where coyotes spend 65% of their time; these were estimated as 65% adaptive kernel (AK; Worton 1989) isopleths calculated via program CALHOME (Kie et al. 1996)."(942)

"Twenty-eight radio-collared coyotes were recaptured 37 times in traps or snares. Age affected probability of recapture with biases toward progressively younger age classes…. M-44s were more biased toward younger coyotes than were traps and snares."(942)

"Coyotes were trapped and snared disproportionately more often when outside their core areas. Only 9 (33%) of 27 trap captures and 13 (43%) of 20 snare captures of resident coyotes occurred within their core areas compared to the 65% expected if coyotes were equally vulnerable inside and outside their cores."(943)

"Coyotes at HREC were especially difficult to capture by stationary devices set in their core areas. A likely consequence of such site-dependent vulnerability is for breeders to be more difficult to remove."(945)

"These data suggest learned avoidance (Andelt et al. 1985) of traps and snares (but not necessarily M-44s) represents general wariness (e.g., of human disturbance) more than avoidance of specific cues (e.g., holes in fences)."(946)

"Removal of nonoffending individuals was ineffective at stopping depredation (Sacks et al. 1999)."(946)

"Additionally, use of 1080 livestock protection collars should effectively target individuals that kill sheep any time of the year, as was suggested by preliminary work on selective removal at HREC (Timm et al. 1997; K.M. Blejwas, unpublished data) and elsewhere (Connolly and Burns 1990)."(947)