birding...

Gaviidae

http://creagrus.home.montereybay.com/loons.html

Family account...

Black-throated Diver Gavia arctica

http://www.rspb.org.uk/wildlife/birdguide/name/b/blackthroateddiver/index.aspx

Species account...

Common Loon Gavia immer

http://www.bio.umass.edu/biology/conn.river/loon.html

The silence of the predawn hours in the northern reaches of the Connecticut River Valley is occasionally shattered by an unearthly tremolo cry, difficult to describe and impossible to forget - almost like a demented person laughing. The caller is a common loon, one of the oldest (most primitive) birds known...

Great Northern Diver Gavia immer

http://www.naturalbornbirder.com/skogsoey/species/gndiver.php

Great Northern Diver is a regular migrant in both spring and autumn at Skogsøy, and is one of the main "target" species for seawatches at all times of year with the exception of the summer months...

Pacific loon Gavia pacifica

http://www.mbr-pwrc.usgs.gov/id/framlst/i0100id.html

Species account...

Red-throated Diver Gavia stellata

http://www.rspb.org.uk/wildlife/birdguide/name/r/redthroateddiver/index.aspx

Species account

White-billed Diver Gavia adamsii

http://www.naturalbornbirder.com/skogsoey/species/wbdiver.php

The White-billed Diver is a regular migrant in both spring and autumn at Skogsøy, although appears more numerous in spring when it is the second commonest diver species. The first birds turn up towards the end of April, though most pass in May with a peak in the first half of the month; occasional birds are observed into June. Daily counts of less than 10 are the norm but during the peak passage period double figure counts are not unusual - the record count is 22 individuals in one day...

Number of bird species: 5

Flight Identification of European Seabirds

by Anders Blomdahl, Bertil Breife & Niklas Holmstrom from Christopher Helm April 2003 Price ?35. See Fatbirder Review
ISBN: 0713660201
Buy this book from NHBS.com

Seabirds

by Peter Harrison - Helm 1985
ISBN: 071363510X
Buy this book from NHBS.com

Common Loon Video

Website

A Cornell Lab of Ornithology video clip...