mitratus, ♂ I. 314, pl. 15, fig. 10
mitratus, ♀ I. pl. 15, fig. 11
pileolatus, I. 319.
pusillus, ♂ I. 317, pl. 16, fig. 3
pusillus, ♀ I. 317, pl. 16, fig. 4
Nauclerus forficatus, III. 192.
Neocorys spraguei, ♀ I. 175, pl. 10, fig. 5
Nephœcetes niger, ♀ II. 429, pl. 45, fig. 4
Nisus cooperi, III. 230.
fuscus, III. 224.
mexicanus, III. 231.
Nyctale richardsoni, III. 40.
acadica, III. 43.
Nyctea scandiaca, III. 70.
Onychotes gruberi, III. 254.
Oporornis agilis, ♂ I. 290, pl. 15, fig. 1
agilis, ♀ I. 290, pl. 15, fig. 2
formosa, ♂ I. 293, pl. 15, fig. 3
Oreopeleia martinica, ♂ III. 393, pl. 58, fig. 1
Oreortyx pictus, ♂ III. 475, pl. 63, fig. 5
Oreoscoptes montanus, I. 32, pl. 3, fig. 6
Ortalida macalli, III. 398, pl. 57, fig. 1
Ortyx texanus, ♀ III. 474, pl. 63, fig. 4
texanus, ♂ III. 474, pl. 63, fig. 3
virginianus, ♂ III. 468, pl. 63, fig. 1
virginianus, ♀ III. 468, pl. 63, fig. 2
Otus brachyotus, III. 22.
wilsonianus, III. 18.
A History of North American Birds · The Wunder Library — complete classics, free to read, with narration.