. The Canadian field-naturalist. 1984 Notes 53 B. Figure 1. Skulls of Thick-billed Murres collected in Trinity Bay, Newfoundland, in February 1981; (A) adult type, (B) first-year type. Table I. Differences between "first-year" and "older" Thick-billed Murres collected in February and November (for aging criterion, see text). Measurement First Year Adult t P X SD N X SD N Weight (g) NOV 15 4 NS FEB 8 45 < Wing (mm) NOV 15 4 FEB 8 45 < Bill: line'
. The Canadian field-naturalist. 1984 Notes 53 B. Figure 1. Skulls of Thick-billed Murres collected in Trinity Bay, Newfoundland, in February 1981; (A) adult type, (B) first-year type. Table I. Differences between "first-year" and "older" Thick-billed Murres collected in February and November (for aging criterion, see text). Measurement First Year Adult t P X SD N X SD N Weight (g) NOV 15 4 NS FEB 8 45 < Wing (mm) NOV 15 4 FEB 8 45 < Bill: line' (mm) NOV 14 4 FEB 7 44 < depth' (mm) NOV 14 4 FEB 9 43 < culmen (mm) NOV 14 4 < FEB 10 44 < nostril' (mm) NOV 14 4 FEB 2,6 10 44 < 'Measured as follows: distance from proximal end of white line above gape to bill tip (line); depth just proximal to notch in lower mandible; distance from distal edge of external nares to bill tip (nostril).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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