That's a surprise, in US one thing that is commonly stressed to new cat owners is that outdoor cats have a significantly lower life expectancy than indoor cats

That's a surprise, in US one thing that is commonly stressed to new cat owners is that outdoor cats have a significantly lower life expectancy than indoor cats (partly due to disease, partly to being hit by cars or injured by other animals)[1], so it isn't just a question of how many birds they kill. 1: https://www.americanhumane.org/fact-sheet/indoor-cats-vs-outdoor-cats/ https://www.americanhumane.org/fact-sheet/indoor-cats-vs-out...