"Focus on..." was published in Wrenderings, the quarterly newsletter for Bird Atlas volunteers. Each article focuses on the identification and distribution of closely related species.

Male and female Cassin's Finches
Photo by Ken Fink

Redhead and Canvasback—Winter 1998

Sharp-shinned and Cooper's Hawks—Fall 2001

Snow and Ross' Geese—Spring 2002

Gambel's Quail —Fall 1997

Lesser Nighthawk —Spring 1998

Royal and Elegant Terns—Summer 2000

Greater and Lesser Yellowlegs—Winter 1999

Nuttall's and Ladder-backed Woodpeckers—Spring 1999

Hairy and Downy Woodpeckers—Summer 2001

Ash-throated Flycatcher and Its Relatives—Winter 2000

Western and Cassin's Kingbirds—Summer 1998

Hermit and Swainson's Thrushes—Summer 1999

Violet-green and Tree Swallows—Winter 1997

Purple and Cassin's Finches—Spring 2001

American, Lawrence's and Lesser Goldfinches—Winter 2001

Black-throated and Sage Sparrows—Fall 1998

Indigo and Lazuli Buntings—Summer 2002

Scott's, Bullock's, and Hooded Orioles—Spring 2000

Red-winged and Tricolored Blackbirds—Fall 2000