Birdsbesafe Cat Collar Cover Birdsbesafe cat collar cover warns birds of cat's presence. (Purchase your own cat collar separately/not included.) Brightly colored collar cover is easily visible to birds whose eyes see bright colors especially well Collar cover is a tube of fabric, and is patented in U.S. Safe for cat when used with breakaway collar. Scientifically shown to greatly reduce cat predation on birds. See details. Collar cover has reflective trim. Can be worn by cat indoors and out.