[mytailorisrich]

The wording is not clear. I doubt that it has the 'opposite' effect. I think they mean that the ones with bells brought in the most catches with the suggestion being that the owners put bells on their cats because they bring a lot of catches in the first place, i.e. the best hunters get bells.

The opposite findings on the effect of bells: https://www.conservationevidence.com/actions/2332

[adrienchauvet]

Interesting. It works partially though. If we could stop the hunt completely that would be optimal because there are so many cats.