This kangaroo leather sparrow harness started out as a joke with my trapping buddy at the time, but we soon realized that it worked very well on Kestrels.  Head of the sparrow goes through the circle, and the small "arms" of the harness go around the body, under the wings.  They tie together with a twist tie (included), string, zip tie, etc.  A small 3' drag line with snap swivel (included) makes the sparrow look injured since it can't fly off, but can still hover off the ground.  Kestrels don't waste much time in getting to a sparrow that looks injured.  What started out as a joke has become one of my favorite ways to catch Kestrels and Merlins.  Color of harness varies. Drag weight not included.

Sparrow Harness