In 2013 a report revealed that domestic and feral cats are responsible for the deaths of 200 million birds in Canada. A new campaign seeks to end this leading cause of the decline of many bird species and also make the cat population healthier.

The campaign, Keep Cats Safe and Save Birds Lives, launched by Nature Canada, asks cat owners to pledge to stop letting their cats roam free outdoors.

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"Both cat and bird populations are in different sorts of trouble," Ted Cheskey, senior manager of the conservation group Nature Canada, told CBC News.

Letting cats roam freely isn't just bad for birds, it also puts the cat's life at risk. "Outdoor cats are exposed to a variety of threats, including diseases (e.g., feline aids, feline cancer, heartworm), vehicle collisions, and fights with wildlife and other cats," the campaign's website reads.

The Keep Cats Safe and Save Birds Lives campaign boasts that so far 130 cats are living longer and 2,103 birds are safer because of cat owners who have signed the pledge.

See images of feral cats around the world:

4 PHOTOS Australia declares war on feral cats See Gallery New campaign asks to keep cats indoors to save millions of birds LOS ANGELES, CA - JUNE 25: A cat wanders the grounds of the Los Angeles Flower Market on June 25, 2015 in Los Angeles, California. Some local business owners participate in the Working Cats program, which uses feral or 'Community Cats' to repel rodents from their stores. (Photo by Mark Boster/Los Angeles Times via Getty Images) A stray cat is pictured at La Recoleta cemetery in Buenos Aires, Argentina, on June 13, 2015. AFP PHOTO/EITAN ABRAMOVICH (Photo credit should read EITAN ABRAMOVICH/AFP/Getty Images) Sunny, a 1-year-old stray cat, was taken in by PAWS Chicago after being rescued by city animal control workers. Sunny suffered from frostbitten ears. (Nuccio DiNuzzo/Chicago Tribune/TNS via Getty Images) CORFU - OCTOBER 04: Stray feral mother white cat, Felis catus, nursing her cute black kittens at Paleokastritsa in Corfu, , Greece (Photo by Tim Graham/Getty Images) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

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