Literature Razorbill
[order] Charadriiformes | [family]

Razorbill determination[order] Charadriiformes | [family] Alcidae | [latin] Alca torda | [UK] Razorbill | [FR] Petit Pingouin | [DE] Tordalk | [ES] Alca común | [IT] gazza marina | [NL] Alk

Subspecies and global distribution

  1. Cepphus torda
  2. Alca torda islandica Iceland, Faroe Is., British Isles to nw France
  3. Alca torda torda ne North America, Greenland to n Scandinavia and the White Sea
  4. Alca torda NA, EU n Atlantic coasts


Sexual Size Dimorphism and Assortative Mating in Razorbills (Alca torda)
Author(s): Richard H. Wagner
Abstract: My primary aim here is to report the first large data set of live, known-sex Razorbills and to identify the degree of sexual size dimorphism in a number of body measurements. This Study is part of a wider project on mating behavior of Razorbills base..[more]..
Source: The Auk 116(2):542-544, 1999
download article (pdf)


Abstract: Intraspecific kleptoparasitism, the stealing of food from members of the same species, has received widespread but mostly superficial attention in the scientific literature. However, the effects of such behavior can be significant. Here we report on ..[more]..
Source: Marine Ornithology 35: 1-7.
download article (pdf)

Age at First Return and Breeding of Razorbills (
Alca torda
on the
Gannet Islands, Labrador and Machias Seal Island, New Brunswick

Abstract: Resightings of Razorbills (
Alca torda
) banded as chicks on the Gannet Islands, Labrador (N = 1,873
resightings of 638 individuals) and Machias Seal Island, New Brunswick..[more]..
Source: Waterbirds 31(1): 30-34, 2008
download article (pdf)

Survival and age at first breeding in the Razorbill (Alca torda)
Author(s): C. S. Lloyd and C. M. Perrins
Abstract: Observations of banded birds on Skokholm were made during daily visits to the cliffs between mid-March and mid-August (1971-73), and the work was continued by the staff of the Bird Observatory in 1974. In one study colony, The Bluffs, visited daily t..[more]..
Source: Bird-banding Summer, 1977
download article (pdf)

Wear and loss of rings used on Razorbills Alca torda
Author(s): Peter Lyngs
Abstract: On Grasholmen in the central Baltic Sea, 3,583 Razorbill Alca torda chicks were ringed with triangular Incoloy rings, and about half the birds were subsequently resighted. The resightings were used to calculate rates of turned rings, and 119 retrieve..[more]..
Source: Ringing & Migration (2006) 23, 39-44
read article (pdf)

Can Norwegian and Russian Razorbills Alca torda be identified by their measurements
Author(s): Robert T. Barrett, Tycho Anker-Nilssen & Yuri V. Krasnov 1997
Abstract: Razorbills Alca torda were measured in one Russian and five Norwegian colonies. A comparison with measurements from colonies in Britain, Ireland, Iceland and the Baltic Sea shows a clear correlation with the geographical position of each colony and a..[more]..
Source: Marine Ornithology 25: 5-8.
download article (pdf)

Sexing Razorbills Alca torda breeding at Machias Seal Island, New Brunswick, Canada, using discriminant function analysis.
Author(s): Grecian V.D, Diamond A.W. & Chardine J.W. 2003.
Abstract: In 2000 and 2001, we determined the sex of 80 adult Razorbills Alca torda caught on Machias Seal Island, New Brunswick, Canada, 71 birds in 2000 and 9 in 2001. Sex was determined for the 2000 birds using DNA from feathers, and for the 2001 captures u..[more]..
Source: Atlantic Seabirds 5(2): 73-80.
download article (pdf)

Diet of Razorbill Alca torda chicks on Gr sholmen, central Baltic Sea
Author(s): Peter Lyngs
Abstract: This paper describes the food of Razorbill Alca torda chicks on Gr sholmen in the central Baltic Sea and concludes that sprats Sprattus sprattus form the main diet, although sandeels Ammodytes sp. in some years constitute up to 22% by number. Clupeid..[more]..
Source: Dansk Orn. Foren. Tidsskr. 95 (2001): 69-74
download article (pdf)

Effects of island isolation and feral mink removal on bird communities (Alca torda) on small islands in the Baltic Sea
Author(s): Mik l Nordström and Erkki Korpimäki
Abstract: 1.) Predation has been suggested as a major cause affecting survival, reproductive success and behaviour in vertebrate prey populations. The breeding season is a critical phase because the essential difference between selecting the proper nest site m..[more]..
Source: Journal of Animal Ecology (2004) 73 , 424-433
download article (pdf)

Winter distribution, ecology and movements of Razorbills Alca torda and other auks in the outer Bay of Fundy, Eastern Canada.
Author(s): Huettmann, F., Diamond, A.W., Dalzell, B. & MacIntosh, K.
Abstract: Casual observations between 1992 and 1997 indicated that up to 25,000 Razorbills may occur around Grand Manan Island, Bay of Fundy, from December to February-numbers far exceeding those of local breeders. Standardized surveys conducted on 26 days bet..[more]..
Source: Marine Ornithology 00: 161-171
download article (pdf)

Sex differences in razorbill Alca torda parent-offspring vocal recognition
Author(s): Stephen J. Insley
Abstract: We investigated differences in parent-offspring vocal recognition between males and females in a natural population of razorbills Alca torda, a long-lived and highly social species of auk (Family: Alcidae). Razorbills provide biparental care to their..[more]..
Source: The Journal of Experimental Biology 206, 25-31
download article (pdf)

All of Alcidae

  1. Ancient Murrelet
  2. Synthiboramphus antiquus
  1. Atlantic Puffin
  2. Fratercula arctica
  1. Black Guillemot
  2. Cepphus grylle
  1. Great Auk
  2. Pinguinus impennis
  1. Guillemot
  2. Uria aalge
  1. little auk
  2. Alle alle
  1. Parakeet Auklet
  2. Cyclorrhynchus psittacula
  1. Razorbill
  2. Alca Torda
  1. Thick-billed Murre
  2. Uria lomvia
  1. Tufted Puffin
  2. Fratercula cirrhata
Join the discussion