A new study just published in the journal Nature Communications, quantifies what we outdoorsmen who have been paying attention have known for years. Cats, especially feral ones, are a huge threat to wildlife. Biologist, in fact, estimate that each year, felines kill as many as 3.7 million birds and 20.7 billion smaller critters such as mice and chipmunks. Now, I'm pretty much okay with the mice and chipmunks, but am decidedly not comfortable with the rabbit slaughter--at all. Further, a University of Georgia study, which included attaching video cameras to 60 cats, found that one-third of a typical cat's day is spent killing stuff.