KEEP YOUR CATS INSIDE. If you let your cats roam free, you're an asshole. --A new study from the University of Guelph paints a clearer picture into the number of birds killed by cats each year in Canada, which it found is on average about 60 million birds.-"It's important to know what [cats'] impacts is on the environment because they are, somewhat, non-native to our environment," Chu told CBC Kitchener-Waterloo's The Morning Edition."Many bird species are in the decline and endangered and, in general, birds are declining all over North America and we've lost four billion birds since 1970 and one of the causes for bird decline that we can measure and know a good amount about are cats in Canada."https://www.cbc.ca/news/canada/kitchener-waterloo/university-of-guelph-birds-killed-by-cats-each-year-9.6942108