email a friend
printable version
Location Canada, Nova Scotia
Central coordinates 66o 22.17' West  44o 13.86' North
IBA criteria A4iii
Area 96,000 ha
Altitude 0 - 30m
Year of IBA assessment 2008

Bird Studies Canada/Nature Canada

Site description Brier Island is located at the extreme western end of Nova Scotia, and is about 50 km southwest of the town of Digby. The site includes Brier Island plus tiny Peter Island and the surrounding marine waters for at least 15 km offshore. Brier Island is 7 km by 3 km in size, and is separated from the neighbouring Long Island by the 1 km-wide Grand Passage. Most of the island is forested except for the village of Westport and the fields surrounding it. Two parallel ridges run across the island, with lowlands such as bogs and ponds, in-between. The waters of the Bay of Fundy surrounding Brier Island are rich and diverse in marine life. Right, Humpback, Fin and Minke whales, and White-sided Dolphin occur here.

Key Biodiversity This island has long been recognized as one of the most important bird areas in the Maritimes, and is considered a mecca for Canadian birders partly due to the diversity of birds that can be seen there. It is a great migration trap for landbirds, and a very important year-round feeding area for marine birds. As of February 2001, 331 species of birds have been recorded in this IBA.

The waters immediately offshore from Brier Island are one of the most important areas for phalaropes in North America. The numbers of mixed flocks of Red-necked and Red phalaropes may regularly number in the millions, although no systematic counts have been made. People frequenting these waters state that 100,000s have been seen annually in August for many years, although researchers seem to be more uncertain about the state of these populations. More specific records include 20,000 Red-necked Phalaropes recorded in 1990, and 10,000 in 1996. In 1984 and 1989, 10,000 and 5,000 Red Phalaropes were reported. Since the global population of Red Phalarope is estimated at 1 million and the North American population of Red-necked Phalarope is estimated at 2.5 million the numbers seen here represent large portions of these species populations. The two phalaropes are often found in tidal streaks, areas where copepods concentrate at the water surface. These feeding areas are associated with underwater ledges found about six and 16 kilometres offshore.

Other marine species seen in large numbers include shearwaters, kittiwakes and alcids. Greater Shearwaters are common in August particularly, with 20,000 recorded in the 1997. Sooty Shearwaters are also common, with smaller and more variable numbers of Manx Shearwater present. Black-legged Kittiwakes are regularly seen in the winter in numbers over 10,000. There is also a record of 40,000 kittiwakes moving past the Northern Point at one point in the 1970s. Thousands of alcids winter in the waters around Brier Island the most common species are Razorbills, Thick-billed Murres, and Dovekie. Numbers of Razorbills are probably significant: 378 were recorded in the winter of 1997/98 on the water, and 8,600 were recorded on passage in 2000.

Banding efforts indicate that the most common landbird migrants in the fall are Yellow-rumped Warbler, Dark-eyed Junco, Golden-crowned Kinglet, White-throated Sparrow, and Magnolia Warbler. Bird banding only occurs over a relatively short period in the fall, but it is thought that if a similar amount of effort were made here as is made in locations such as Long Point in Ontario, the numbers of fall migrants banded might be comparable.

Numbers of migrating raptors are also notable in the autumn. At least 10,000 raptors pass through the area at this time (nationally significant under IBA criteria)., Based on extrapolation, it has been estimated that between 8,000 and 10,000 Sharp-shinned Hawks, and from 3,000 to 4,000 Broad-winged Hawks pass over the area. Peregrine Falcons are also seen frequently.

Flocks of Atlantic Brant pass through the site in continentally significant numbers. For example, 2,000 birds were surveyed in the spring migration of 1997; this represents over 1% of the eastern population. Gulls and terns breed on Peter Island; Roseate Terns used to be part of the colony, but are no longer present.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
A4iii Species group - waterbirds passage  20,000-49,999 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Briar Island Nature Conservancy Nature Conservancy of Canada Lands 377 protected area contained by site 380  
Central Grove Provincial Park 12 protected area contained by site 13  
Gull Rock Road Brier Island Nature Conservancy of Canada Lands 9 protected area contained by site 10  
Peajack Road Brier Island Nature Conservancy of Canada Lands 392 protected area contained by site 410  
Ventral Bog Sites of Ecological Interest 24 protected area contained by site 25  


IUCN habitat Habitat detail Extent (% of site)
Forest Temperate mixed woods  30%
Shrubland Scrub  10%
Sea Open sea; Sea inlets  50%
Coastline Sea cliffs and rocky shores  10%

Land use

Land-use Extent (% of site)
nature conservation and research minor
fisheries/aquaculture major
tourism/recreation minor

Contribute  Please click here to help BirdLife conserve the world's birds - your data for this IBA and others are vital for helping protect the environment.

Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Brier Island and Offshore Waters. Downloaded from on 25/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife