Owls: a guide to the owls of the world
"Many species of owls are difficult to separate by plumage alone; this problem is compunded by the different morphs they adopt. This book fully describes every known species of owl, as well as presenting the latest evidence on owl taxonomy based on DNA evidence and vocalizations. Because voice is vital in owl identification a great deal of emphasis is placed on it."
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A-song Adult Facial disc Adult nominate Argentina Barn Owl belly bill biology birds blackish blackish-brown Boyer & Hume BREEDING Bubo buff buffy Cere Claws crown dark brown darker dense DESCRIPTION Adult DISTRIBUTION dusky Eagle Owl ear-tufts eggs Eurasian Eagle Owl eyebrows Eyes yellow female Ferruginous Pygmy Owl FOOD forest GEOGRAPHICAL VARIATION Monotypic Glaucidium grey-brown greyish-brown HABITAT Hawk Owl holes Hume l99l incubates insects Islands larger Long-eared Owl lowlands male mantle MEASUREMENTS AND WEIGHT Mesoptile Monotypic montane mottled MOVEMENTS Resident nape nest Ninox occipital face outer webs Owlet pale paler perch Plate plumage prey prominent Pygmy Owl Red morph roosts rufous-brown scapulars Scops Owl Otus Screech Owl shaft-streaks Similar species smaller Southern Boobook Spectacled Owl STATUS AND CONSERVATION streaked Strigidae subspecies tawny Tawny Owl Tengmalm's Owl Text and map throat tips trees Tyto upper breast Upperparts uttered vermiculations WEIGHT Total length Western Screech Owl white spots whitish Wing wing-coverts