Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: Several gruesome discoveries involving mutilated animals have prompted a southwestern Ontario humane society to warn pet owners about a possible serial animal killer on the loose. 
  
 Last week, police in London, Ont., responded to a report of a headless dog found on top of a recycling bin near a beer store. The animal had been skinned and was missing organs. 
  
 It was the latest in a series of similar disturbing incidents in which dead animals were found in public places around the city, according to the London Humane Society's executive director Judy Foster. 
  
 Over the last year, Foster said, there have been at least eight incidents involving 17 dead animals, including a skinned and beheaded bunny found on the Western University campus, a mutilated cat found in a park, six dead coyotes — two of them headless and skinned — placed in a pose in three different locations, and seven dead snakes left in a strange pose. 
  
 A stabbed and partially skinned goose was dropped off at the humane society's front door, she said. 
  
 "It doesn't make me feel better knowing there is such great similarities between all of these and the disturbing part is you don't know when the animals died — at the start, halfway through or as a result of what was done to it," Foster said. "It's impossible to forget what we've seen. 
  
 All animals mutilated 
  
 All the animals were found with some form of mutilation, but there was no blood at the scenes, Foster said, suggesting they were killed elsewhere. 
  
 A scalpel appears to have been used in each case, she said. 
  
 "The animals are incredibly clean," Foster said. "We believe that it would take a fair amount of time to do that." 
  
 It also looks like the pattern is escalating, she said. First it was wildlife — coyotes and geese — and then a bunny, a cat and now a dog. 
  
 Foster said she doesn't know if it's the work of one person, a group or even copycats. 
  
 But Michael Arntfield, a criminology professor at Western University, believes one person is behind all the incidents. 
  
 "This will continue to escalate," he said in a phone interview. "This is not a prank, it's not mischief, it's sexual, it's predatory, it's high risk and it's criminal." 
  
 Criminologist says killings likely done by one person 
  
 Arntfield, a former police officer, is confident that one of the incidents — the mutilated goose that was dropped off at the humane society — suggests the person has been to the humane society before. 
  
 Two years ago, Arntfield said he received a tip that someone was going to the London Humane Society claiming to be a rescuer and asking to adopt animals "with the sole purpose of torturing them and mutilating them." 
  
 Criminologist Michael Arntfield believes the string of animal killings and mutilations are the result of one person. (Michael Arntfield) 
  
 Arntfield told police and the humane society and urged them to examine the adoption files. Nothing happened, he said. 
  
 "This is a serial animal killer," Arntfield said, calling it a clear case of zoosadism — being sadistic to an animal — with an underlying sexual component. 
  
 Arntfield said he is concerned that whoever is behind the animal killings could potentially move on to more serious crimes targeting humans. 
  
 The incidents have left the humane society reeling. 
  
 "We're doing OK, but I'm not going to downplay it," Foster said with a heavy sigh. "I felt physically ill when I saw the dog, and the bunny, the cat, the goose, the coyotes...the skinned coyotes we thought were dogs initially." 
  
 She said counsellors are coming in soon to help staff deal with the gruesome discoveries. 
  
 "The longer we talk about this, the hair on my arms are standing straighter and straighter," Foster said. "It's chilling. And at a certain point, when these things keep happening, we also need to be concerned about public safety — public human safety." 
  
 London police said they are taking the matter very seriously. 
  
 Const. Sandasha Bough said the force has assigned an investigator to the case, but noted they were only made aware of two incidents — two dead coyotes found by a grocery store last February and the beheaded dog last week. ||||| Another disturbing discovery of a mutilated, beheaded dead animal — this time a small dog — has been made near a London Beer Store, marking at least the eighth disturbing carcass found in or near the city this year. 
  
 That has rung alarm bells for both the local humane society and a Western University criminologist who point to animal mutilations as signs of escalating behaviours common to killers. 
  
 “You don’t want to think the worst for your own community, but at what point do we say we really need to be wondering, we really need to be trying to figure out how this is happening,who is doing this, what’s the root of this?” said Judy Foster, the executive director of the London Humane Society. 
  
 The dog was found beheaded, skinned and cleaned near a dumpster behind the Beer Store on Adelaide Street on Friday, sparking an investigation by animal-cruelty investigators. 
  
 Two vets have looked at the remains and have determined that it is a dog. It had been beheaded, skinned, had puncture wounds and the blood removed before it was left in plain view. 
  
 “What would drive somebody to commit that act, that level of violence against such a small body?” Foster said. 
  
 Already in 2016, several animals have been reported to the humane society that were found killed and left for people to find including: 
  
 • Two coyotes behind the Metro store on Clarke Road. 
  
 • A mutilated cat in Springbank Park. 
  
 • A beheaded bunny at Western University campus. 
  
 • Two beheaded coyotes, also at the university campus. 
  
 • Snakes found killed and posed. 
  
 • A goose that was skinned, stabbed and left on the steps of the Human Society. 
  
 • Two dead animals found on a walking trail near Ailsa Craig. 
  
 “The commonality between all of them – the animals have suffered a degree of mutilation, they’ve all been left in a public place, in a high- traffic place,” Foster said. 
  
 With the exception of the bunny and the cat, all the animals were found in cold temperatures. All of them appear to have been exposed to a scalpel, either for stabbing or skinning. 
  
 All of them appear to have been cleaned, with the exception of the cat, whose body may have been interferred with by other wildlife. 
  
 “I’m not seeing it happen in other communities. This is something that is uniquely happening in London.” 
  
 Western University criminology professor Michael Arntfield said he’s been sent photos of a group of geese with their beaks broken and placed in a semi-circle in Old South. 
  
 Another person has contacted him replicating a set of snakes that were killed using pieces of plastic. 
  
 “It’s crossing the species boundary now and it’s no question that it’s the same people or group of people,” he said. 
  
 Crossing the species notes a level of sadism, he said and that this is “a prepatory behaviour that will inevitably escalate to more sophisticated forms of offending, up to and including human victims.” 
  
 Arntfield said the clinical and forensic literature “overwhelming points to spectrum of prepatory paraphilias” that lead to a number of high-risk behaviours. 
  
 The person is aroused by “visual vignettes” of entrails, dismemberment and extreme gore. 
  
 The animals are often left posed — for example, the coyotes in a circle, the geese in a semi-circle — and “speak to increasingly elaborate fantasies that are playing out with a wider variety of species.” |||||
Output:
"It's impossible to forget what we've seen," says the director of a Humane Society in London, Ontario, where officials say a serial animal killer is on the loose. Over the past year, 17 dead animals have been found around the Canadian city. It started with skinned and headless coyotes and a stabbed and partially skinned goose left outside the Humane Society's front door, reports the Canadian Press. But lately domestic animals—including a skinned and headless bunny and a mutilated cat—have been found in public places. The most recent discovery came last Friday, when a skinned dog missing its head and several organs was found outside a beer store, reports the London Free Press. Like the other animals, the dog appeared to have been mutilated with a scalpel and deliberately left in a public spot. All the animals were drained of blood and expertly cleaned, and most were left in poses (including snakes). Authorities say it's unclear if the animals were dead before the mutilation began. Police are now investigating, but criminology professor and former police officer Michael Arntfield believes the crime spree could stretch back more than two years, when he says he received a tip that an individual was adopting pets from the Humane Society simply to torture and kill them; he says he notified police. "This is not a prank," says Arntfield. This is "a prepatory behavior that will inevitably escalate to more sophisticated forms of offending, up to and including human victims." (Someone previously burned dogs in LA.)