Birding Alaska

From May 13-20 I was on Adak Island in the central Aleutians leading a birding trip for Wilderness Birding Adventures. The Asian rarity highlights from the trip were a female Smew and a Hawfinch. Least Sandpiper and Northern Wheatear were very good finds from an island perspective. Rarities aside, Adak has an interesting list of subspecies endemic to the central Aleutians, a diversity of seabirds and the ever present feeling of anticipation that something truly rare might blow in.  Below are some photos from the trip.

Northern Wheatear Oenanthe oenanthe, Adak, 15 May 2010.

Casual in the spring in the central Aleutians, this male is only the third spring record for Adak Island.

Smew Mergellus albellus (foreground) with female Common Goldeneye Bucephala clangula, Shotgun Lake, Adak, 16 May 2010.

Gray-crowned Rosy-finch Leucosticte tephrocotis griseonucha, Adak National Forest, 14 May 2010.

The Aleutian Gray-crowned Rosy-finch, griseonucha, is larger than littoralis, the breeding race from south coastal and southeast Alaska and approaches umbrina (from the Pribilofs) in size. It is slightly browner overall than umbrina. These three races of Gray-crowned Rosy-finch share the gray crown and completely gray cheek of coastal varieties of the species.

Turner’s Rock Ptarmigan Lagopus mutus atkhensis, Adak, 18 May 2010.

Turner’s Rock Ptarmigan is endemic to the islands of the Central Aleutians.

Pacific Golden-Plover Pluvialis fulva, Contractor’s Camp, Adak, 17 May 2010.

A flock of six at Contractor’s Camp were the only that we saw. The species is a regular migrant at Adak.

Wandering Tattler Tringa incana, Finger Cove, Adak, 17 May 2010.

Wandering Tattler is a regular migrant on Adak in small numbers. This individual is separated from the similar Gray-tailed Tattler by it’s darker gray upperparts, coarse barring on the lower belly, dark forehead, and nasal groove (not nostril) which extends for greater than half the length of the bill. The call is also diagnostic.

Hoary Redpoll Acanthis hornemanni, Adak National Forest, 16 May 2010.

A rare visitor to Adak, this species has nested in the central and western Aleutians. Up to four Common Redpolls were also present on Adak during our stay.

Least Sandpiper Calidris minutilla, Sweeper Creek, Adak, 20 May 2010.

When Birds of the Aleutian Islands, by Gibson and Byrd was published in 2007 there were no records of this species from the central Aleutians. It has since been recorded at least 5 times at Adak.  We had a flyby at Clam Lagoon on 13 May and this bird at Sweeper Creek on 20 May. The overall dark plumage, compact build, all black lower mandible and white forehead separate it from the similar Long-toed Stint C. subminuta.
For photos of the elusive Hawfinch Coccothraustes coccothraustes, probably the “best bird” of our trip see Isaac Helmrick’s blog.

Back in the Bering Sea on the NOAA Ship Oscar Dyson.  We left Kodiak on April 23rd and we’ll finish this cruise in Dutch Harbor on May 3rd. The mission of the cruise is to service oceanographic moorings in the eastern Bering Sea.

Young Spotted Seal Phoca largha, Bering Sea, 28 April 2010.

Thayer’s Gull Larus thayeri and third-cycle Glaucous Gull L. hyperboreus, Bering Sea, 28 April 2010.

While watching seals on a small flow of brash ice about 60 miles north of Unimak Island today I noticed this adult Thayer’s Gull in a group of Glaucous and Glaucous-winged Gulls. Thayer’s Gulls are probably casual in the Bering Sea. This adult is separated from Herring, Vega, and Herring x Glaucous-winged Gull hybrids by outer primary pattern, its smallish bill and rounded head, and relatively long primary projection.

Milbert’s Toroiseshell, Aglais milberti, Homer, 9 April 2010.

Despite the piles of snow still in the yard, the first butterfly of the spring came out today.

On March 6th I left Kodiak on the USCG icebreaker, Polar Sea.  We transited west to Unimak Pass and north to St. Lawrence Island as part of the Bering Sea BEST project, a partnership between the North Pacific Research Board and the National Science Foundation.  We rolled back into Kodiak on April 7th after 33 days at sea.  Here are a few photos from the trip…

Spectacled Eider Somateria fischeri, St. Lawrence Island Polynia, Bering Sea, 23 March 2010.

A flock of Spectacled Eiders from 1000 feet up.  The entire world’s population, about 370,000 birds, winters in the limited open water of the St. Lawrence Island polynia in the Bering Sea.

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First cycle Thayer’s Gull Larus thayeri, Homer Spit, 25 February 2010.

Thayer’s Gull is a good find in Homer in the winter.  This first cycle bird was in a flock of 4,000 gulls at the offal discharge site on the end of the Homer Spit.  It was first reported by Martin Renner on 21 February.  Rich MacIntosh and I found the bird again on 25 February and got these photos.  Most of the gulls were Glaucous-winged L. glaucescens, and Mew Gulls L. canus brachyrhynchus.  Also present in the flock was one first cycle Glaucous Gull L. hyperboreus and an adult Herring Gull L. argentatus smithsonianus.

Structurally this Thayer’s Gull is identified by it’s smaller size, more rounded head, smaller and narrower bill, and wings that are proportionately longer than the abundant Glaucous-winged Gull.  Also, on this Thayer’s Gull the outer primaries, tail and tertials are darker than the rest of the upper parts–this is evident on both the sitting an the flying bird.  Note that the primaries of this Thayer’s Gull are dark brownish with pale fringes.  A first cycle Herring Gull would have more blackish primary tips lacking the pale fringes.  The upperparts of a first cycle Glaucous-winged Gull is very uniform in tone and the primaries, tail and tertials do not contrast with the rest of the upperparts.  See the next two photos for comparison with Glaucous-winged Gull.

First cycle Glaucous-winged Gull Larus glaucescens, Cordova, 30 December 2005.

First cycle Glaucous-winged Gull, southern Bering Sea, 26 February 2009.

On both of these Glaucous-winged Gulls note the completely uniform tone of the upper parts.  There is no contrast between the tail, outer primaries, tertials and the rest of the upper parts.