What is the Avalon Seawatch?

The Avalon Seawatch, a count of migrating seabirds, is conducted on the beach between 8th and 9th Streets, Avalon, NJ. This location was selected because the northern tip of Avalon extends a mile farther out into the ocean than the coastline to the north. Southbound seabirds that are following the coastline pass very close to this beachfront.

The migration of seabirds along the coast of New Jersey is spectacular, and an average of almost 800,000 seabirds are counted at the Avalon Seawatch annually. In some years the count approaches one million birds. As remarkable as those numbers are, the bulk of this flight is extremely contracted. In most years about 70 percent of all the migrant seabirds pass in five weeks (from about October 7 to November 14). Varieties can and do show up at any time, and some very unexpected species have chosen to fly by the Avalon Seawatch during the past 19 years.


Sept 22nd to Dec 22nd

Sunrise to Sunset

Thank You Avalon Seawatch Supporters

The Counts

Water Bird Migration Counts

Background of Water Bird Migration Counts

Although less widespread than raptor migration counts, several water bird migration projects , like Avalon, NJ, Whitefish Point, MI, and Braddock Bay, NY, have systematically counted sea ducks and water birds for more than ten years. The water bird migration count operated by New Jersey Audubon at Avalon has been counting water birds since 1995. The site is unique in that it provides an unobstructed view of the Atlantic Ocean at a point where the coast juts out approximately one mile further than the coastline to the north, causing the water birds to turn and pass close to the count site.

Assessing population status and trends in many Arctic and sub-Arctic breeding waterfowl and water birds poses a tremendous challenge. The logistical difficulties in counting water birds across their range during the nesting season are obvious. This is also true of assessing wintering populations spread across the offshore waters of large lakes and extensive coastlines. However, systematic water bird counts from a fixed point along a migration route could be very useful, providing information which can be used to augment other census methods.

How the Count Operates

The Avalon Seawatch is located at the seawall at the east end of 7th Street in Avalon on the Atlantic Ocean, just south of Townsend’s Inlet. The count is conducted from sunrise to sunset, 7 days a week, in all weather conditions. from 22 September to 22 December, using binoculars and spotting scopes. The primary counter counts five days a week, and a secondary “relief” counter covers the other two days. The data are recorded in hourly segments, and recorded on current standard forms. The totals are accumulated using either hand held or, for species migrating in large groups, multiple-unit tally counters.

The overall flight is mainly affected by seasonal and daily temporal patterns, and to a lesser extent by wind direction, and wind speed. Visibility is always a factor, as reduced visibility hinders the counters’ ability to assess the flight. It takes a hardy soul, and an experienced birder to conduct the Sea Watch!

Characteristics of the Flight

In general, the flight tends to be heaviest early and late in the day, although during big flights it is fairly consistent throughout the day. Southerly and easterly winds seem to be more conducive to sea bird flights than northerly or westerly winds. For most species, the flight line is essentially north to south along the coast. However, there are a few species that will fly inland from over the ocean, most notably cormorants, geese, and herons/egrets. Most of the time, the flight is fairly low, but dabbling ducks, cormorants, geese, and a few other species can get quite high.

Determining what to count, and when, is usually fairly clear, as most seabirds approach from the north, and disappear to the south. However, experience has shown that gannets, terns, and gulls find the mouth of Townsend’s Inlet and the nearby offshore waters an inviting feeding locale. At these times, the counter must be careful to determine whether or not these birds are feeding and then moving on, or choose to remain for the day.

Avalon SeaWatch Summary Data (1995 – 2016)

~15.6 million individuals, 129 species (Mean = 707,348.86 ± SE 28,044.91)

Species Mean ± SE Max count (Yr)
Red-throated Loon (Gavia stellata) 61,027 ± 3,696 107,455 (2015)
Double-crested Cormorant (Phalacrocorax auritus) 178,466 ± 7,343 240,670 (1996)
Northern Gannet (Morus bassanus) 69,216 ± 7190 154,104 (2015)
Great Blue Heron (Ardea herodias) 1,192 ± 460 10,767 (2003)
Snow Goose (Chen caerulescens) 5,325 ± 1,026 17,146 (1995)
Surf Scoter (Melanitta perspicillata) 142,138 ± 8,117 211,251 (2003)
Black Scoter (Melanitta americana) 150,835 ± 11,454 256,633 (1999)
White-winged Scoter (Melanitta fusca) 2,177 ± 350 6,126 (1995)
Red-breasted Merganser (Mergus serrator) 2,936 ± 327 6,586 (1998)
Parasitic Jaeger (Stercorarius parasiticus) 185 ± 34 667 (2013)
Bonaparte’s Gull (Chroicocephalus philadelphia) 3,843 ± 501 8,647 (1995)
Laughing Gull (Leucophaeus atricilla) 17,683 ± 2,274 51,263 (2000)
Ring-billed Gull (Larus delawarensis) 13,301 ± 1,702 32,879 (2005)
Forster’s Tern (Sterna fosteri) 6,774 ± 1,016 18,593 (2015)