> Your cat doesn't know which species are of least concern, and you certainly aren't seeing every bird or small mammal or reptile your cat kills for fun.

Of course they don't know which is of least concern, but by and large I do see everything they kill because they bring it home and I have to clean it up. It is in their nature to bring it home.

> A bell on your cat's collar doesn't make much difference.

Bells and other deterrents absolutely do make a difference (https://www.frontiersin.org/articles/10.3389/fevo.2022.85044...)

There's barely any species of concern in urban environments anymore, because:

* Industrial run-off * Habitat destruction * Roads and highways with vehicles * Air pollution * Light pollution * Poisons * Electrocution from power lines * Buildings with glass (actual a #2 killer of birds!) * Hunting (both legal and illegal)

Domestic cats are merely a cherry on top of the myriad of environmental mistakes humans have made in the name of progress.

They are simply acting on instinct and trying to be happy in a world of human creation.

If you truly care about birds I would urge you to:

* stop driving * use no lights past dusk * not use or consume any product that contributes to air pollution * not use any power grid that uses power lines * not use any building with glass * not consume any poultry