What exactly is a Chicken Hawk? Or a Sparrow Hawk, or Pigeon Hawk? Or even a Duck Hawk, for that matter? You don't hear the terms very often any longer, but old bird books actually list those as the ...

Bob Rosenfield holds a pair of Cooper’s hawks in a city park in Victoria, Canada. The female, in the foreground, is a third again as large as her mate. Eric Wagner Bob Rosenfield stares up into the ...