Definition: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period. ||||| If you're of the belief that Hollywood's Cats & Dogs didn't offer a clear enough victor in the age-old "cats vs. dogs" debate, don't worry. Science is here with an answer of its own. 
  
 A new study published in PNAS reveals that, when taking history and science into it or whatever, cats have proven to be the more successful species over time. 
  
 See also: Portraits of aging dogs will tug at your heart strings 
  
 According to the study, an analysis of more than 2,000 fossils revealed that prehistoric cats and dogs competed for food, and cats won. Cats, being the better predators, at least partially caused the extinction of 40 different canine species. 
  
 The canine species we know today (wolves, foxes and their relatives) survived the competition, which is maybe why they're sooooo much cooler than cats (Editor's Note: This is the author's opinion, but it is true, so whatever). 
  
 "We usually expect climate changes to play an overwhelming role in the evolution of biodiversity. Instead, competition among different carnivore species proved to be even more important for canids," the study's leading author said in a statement. 
  
 The study also revealed that, contrary to the effect cats had on dogs, prehistoric canines had little impact on the survival of cat species. 
  
 Let's just see what happens in the next few thousand years before we make too quick a judgment on this one, okay? ||||| Extinction is a ubiquitous feature of biodiversity history, and although many lineages increase in diversity through time, most of them eventually decline and get replaced. Dinosaurs and mammals represent an extreme and iconic example of such replacement. Here we investigate the causes of the sequential wax and wane of three subfamilies in the dog family Canidae. Contrary to current expectation, we find that competition from phylogenetically distant, but ecologically similar, clades played a more substantial role in canid diversification than climate change and body size evolution. Our results provide novel quantitative evidence indicating that competition from multiple clades can actively drive the displacement and extinction of entire lineages. 
  
 Abstract 
  
 The history of biodiversity is characterized by a continual replacement of branches in the tree of life. The rise and demise of these branches (clades) are ultimately determined by changes in speciation and extinction rates, often interpreted as a response to varying abiotic and biotic factors. However, understanding the relative importance of these factors remains a major challenge in evolutionary biology. Here we analyze the rich North American fossil record of the dog family Canidae and of other carnivores to tease apart the roles of competition, body size evolution, and climate change on the sequential replacement of three canid subfamilies (two of which have gone extinct). We develop a novel Bayesian analytic framework to show that competition from multiple carnivore clades successively drove the demise and replacement of the two extinct canid subfamilies by increasing their extinction rates and suppressing their speciation. Competitive effects have likely come from ecologically similar species from both canid and felid clades. These results imply that competition among entire clades, generally considered a rare process, can play a more substantial role than climate change and body size evolution in determining the sequential rise and decline of clades. |||||
Output:
It's official: Cats are better than dogs. Better predators, that is. So say researchers in the Proceedings of the National Academy of Sciences after looking at more than 2,000 fossils of prehistoric cats and dogs in North America. It turns out that when cats arrived on the continent 20 million years ago, which was about 20 million years after prehistoric canines started to call it home, cats were more successful hunters and helped cause the extinction of 40 species of canines vying for the same foods, reports the Telegraph. "We usually expect climate changes to play an overwhelming role in the evolution of biodiversity. Instead, competition among different carnivore species proved to be even more important for canids," writes the lead researcher. "These results imply that competition among entire clades, generally considered a rare process, can play a more substantial role than climate change and body size evolution in determining the sequential rise and decline of clades," the researchers write. In fact, the canine species that survived that competition are the early ancestors of those alive today, including wolves, foxes, jackals, and of course dogs, reports Mashable. What's more, unlike the calamitous effect cats had on dogs, prehistoric canines had little discernible impact on the course of cat species. (See what the world's oldest cat enjoyed on his 26th birthday recently.)