Cepphus grylle - Black guillemot:

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Summary Information
Living Organisms / Animalia / Craniata / Aves / Ciconiiformes / Laridae / Cepphus / Species

This section is currently predominantly used in Wildpro to link different data types and demonstrate inter-relationships. Although it identifies that taxonomic interrelationships of species (see "header") it does not currently contain detailed information on the bird species itself. As WILDPro is developed, we will gradually convert these pages into full Species pages.

The taxonomy of birds is still under review and the A World Checklist of Birds by Burt L. Monroe, Jr and Charles G. Sibley (B89) has been chosen as the primary reference. The taxonomic structure will be amended when new editions or complete references are identified by the scientific world as the recognized primary references for taxonomy.

Alternative Names
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Distribution Northern Holarctic; winters to eastern United States (B89)
Habitat Breeding - "Rocky coasts" (B163)
Further Information Feeding:
  • food - mainly fish and crustaceans; sometimes aquatic inverts
  • feeding behaviour - mainly surface dives


  • location and structure - Crevices on cliffs
  • nest building - little material required
  • breeding structure - monogamous


  • markings - patterned; whitish to buff or pale blue-green
  • number of eggs - 1-2 (3?)
  • broods - one brood per season
  • incubation - by male and female; 23-40 days


  • development - Semi-precocial; stays in nest; fed by parents
  • parental caring for young - by male and female
  • fledging - 31-51 days

(B163, B164)

Organisations (UK Contacts):

Electronic Library (further reading):

General Legislation:

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Individual techniques:

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