I had to stop putting out birdseed because my cats were killing the birds and the mate would chirp sadly all day in my back yard calling for their dead spouse.
It was a bummer on 2 levels.
And then the cats would lose interest, conceding the dead bird to my dogs, who would get in trouble. I think the cats did that on purpose because they hate the dogs.
Lol cats vs dogs. A very old and dangerous rivalry.