wren, 36–38, 40, 85–86, 89, 101, 103, 105–106, 131, 142, 231, 302, 357, 376

Wyoming, 30, 169, 176, 186, 191, 208–209, 224

yellowbirdSee also finch; warbler, 80, 82

yellowhammer, 103

Yellowstone National Park, 26, 120, 170, 176, 189, 191–193, 195–196, 216, 224, 283, 285, 287–289, 319, 322, 365

yellowthroatSee also warbler, 38, 79–80, 107

Yosemite National Park, 1, 102, 110–111, 286, 289, 293, 310, 322

zebra, 8–9, 15, 44, 233–236, 253