I also have not seen birds in my backyard for sometime now. I put it down to not feeding the birds regularly and the nasty weather. But now I am worried that these fellows have been devouring them. I also have never seen this many cats in the neighbourhood in the years I have lived here. Since our house backs onto a conservation area I am now wondering if there is someway I can get rid of the cats. Perhaps some 'cat haven' place could take them? Should cats in Canada have collars?