Bill Walker:
Mission San Xavier
Bill Walker:
Mission San Xavier
Bill Walker:
Varied Bunting
Bill Walker:
Bighorn Sheep (captive)
Bill Walker:
Butterfly
Bill Walker:
Northern Cardinal
Bill Walker:
Rufous-winged Sparrow
Bill Walker:
Canyon Towhee
Bill Walker:
Violet-crowned Hummingbird
Bill Walker:
Thick-billed Kingbird
Bill Walker:
Mesquite
Bill Walker:
Plumbeous Vireo
Bill Walker:
Elegant Trogon
Bill Walker:
Botteri's Sparrow
Bill Walker:
White-line Sphinx Moth
Bill Walker:
Lucifer Hummingbird
Bill Walker:
Northern Beardless-Tyrannulet
Bill Walker:
Summer Tanager (formerly mistitled)
Bill Walker:
Mississippi Kite
Bill Walker:
Ocotillo