An effort is underway at the lab of Ken Otter, at the University of Northern British Columbia
to conduct field research with the Birdsbesafe cat collar cover. See an update here:
Ken Otter interview article.
Another field study has begun at the Switzerland research group known as SWILD under Madeleine Geiger, in cooperation with the Swiss Ornithological Institute.
UPDATE April 29, 2022. This
field study's results were just published, and we will make further remarks soon. They found a significant reduction of 37% in birds caught when cats wore Birdsbesafe devices. Notably, many of the subject cats (up to 15 of 31) had long fur coats, which could possibly have influenced results by hiding too much of the Birdsbesafe fabric from view.