dr. garrett came to canada to investigate her death.before but he's seen a pattern with coyotes. they are encroaching on humans. normally it's harmless. last week, a woman in fargo, north dakota captured this coyote killing a deer in her backyard. but people are starting to bear the scars. anywhere from three to five people are attacked in the u.s. every year. with daytaylor,dyed they try to eat her? >> no, they tried to eat her. >> reporter: wow. >> there's no doubt. she was found right here. >> reporter: this is where the coyote csi work began. a tourist on the path that day snapped this picture moments earlier. then, another picture with another coyote approaching. over the next few days wildlife officials trapped and killed several coyotes. they call up with their cull prilts, three in all. one of them had human remains in its stomach. >> their motivation for attacking her was to kill and eat her just like they would any other prey item such as a deer. why that happened that's what we don't understand. >> reporter: if i see a coyote

dr. garrett came to canada to investigate the teenager's death. before but he has seen a pattern with coyotes. they're increasingly and fearlessly encroaching on humans. normally it's harmless. just last week a woman in fargo, north dakota, captured this coyote killing a deer in her backyard. but people are starting to bear the scars of their incounters. three to five people are attacked in the u.s. every year. is ancient coyote behavior evolving right in front of us? to get the answer, we have to look at their history. over the last century they've been on the move, spreading out in every direction. when wolves, their normal enemies, became their romantic partners, that may have been the start of the problem. >> they came into contact with our remnant population of eastern wolves and interbred. all the coyotes that went on to colonize the northeastern united states and eastern canada carried with them some wolf dna they picked up here in southern ontario. >> reporter: the result, a hybrid coyote, larger, less intimidated, fearless animal with att