In April 2022, a newly published article in the Journal of Fish and Wildlife Management reflected on two new, small field studies of the Birdsbesafe cat collar cover by cooperating teams in Florida and upstate New York, U.S.
In "How Effective is the Birdsbesafe cat collar cover at reducing bird mortality by domestic cats?", the authors results indicate in their caption of Figure 2.
"When wearing the Birdsbesafe collar cover, cats killed and brought home 61% fewer birds, 37% fewer mammals, and 47% fewer herpetofauna compared to when wearing no collar. The reduction in birds recovered was significant (P = 0.006, n = 53."