. A practical handbook of British birds . t longest, 2nd3-5 mm. shorter, 3rd7-15 shorter, 4th 18-25shorter, 5th 28 - 37shorter ; narrow andpointed. Outer second-aries shorter than 10thprimary, inner onesabout equal to 8th or 9th, tips rounded. Tail wedge-shaped, 12 feathers, pointed andnarrow, central pair longest. Tibia feathered almost to jointand inserted far back ; tarsus compressed ; three toes (hind toeabsent) fully webbed ; claws curved and rather short, middle onedilated. Bill in adult much compressed, sides nearly flat with threewell defined curved grooves on upper and two on lower ma
. A practical handbook of British birds . t longest, 2nd3-5 mm. shorter, 3rd7-15 shorter, 4th 18-25shorter, 5th 28 - 37shorter ; narrow andpointed. Outer second-aries shorter than 10thprimary, inner onesabout equal to 8th or 9th, tips rounded. Tail wedge-shaped, 12 feathers, pointed andnarrow, central pair longest. Tibia feathered almost to jointand inserted far back ; tarsus compressed ; three toes (hind toeabsent) fully webbed ; claws curved and rather short, middle onedilated. Bill in adult much compressed, sides nearly flat with threewell defined curved grooves on upper and two on lower mandible,ridge of upper mandible decurved in an arc to blunt pointed tip,under mandible sloped up from prominent angle but somewhatrecurved at tip, proximal portion of bill covered with feathersexcept along gape where on each mandible is a prominent hornyridge. In first winter birds bill is very much smaller, much lessarched, sides not grooved, and rictal ridge not prominent. Insecond winter bill is much more like adult but smaller, not so. Gresfer covertsuvenile Primary coverts\/eni/e Underside of wing of juvenile Razorbill (A. torda) showing-primaries and secondaries commencing to grow underjuvenile coverts, which from above have appearance ofremiges. * It would appear that some individuals do not attain the brown throatin first summer, but no skins of such birds are available for examination.—H. F. W. 794 A PRACTICAL HANDBOOK OF BRITISH BIRDS. arched and with only one distinct groove, though often indicationof a second. Nostril in adult very narrow slit in distal corner offeathered portion of culmen and almost concealed by feathers, infirst winter wider and more exposed. Soft parts.—Bill black with a curved line white in summeradult, greyer in winter adult, duller grey in second winter andabsent in first winter and summer ; legs and feet black ; iris darkbrown. Characters.—No subspecies. Pointed tail-feathers, deep bill andwhite or whitish fines from culmen to eye distin
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirds, bookyear1920
