Birding Alaska

Horned Lark Eremophila alpestris flava, Eastern Bering Sea, 31 August 2010. Click on photos to enlarge.

Another hitchhiker this morning. The yellow throat and supercillia identify this Horned Lark as the flava subspecies, breeding in eastern Russia. It winters in southern Russia, northeast China and Japan and is a casual fall migrant to the islands of the Bering Sea.

Before landing on the ship this morning the Horned Lark was doing laps around the ship with a smaller mystery passerine. Unfortunately, that one got away.

Other migrants flying by the ship today were 11 Pacific Golden-Plovers, 1 Ruddy Turnstone and 1 Tattler sp.

• Brazil, M. 2009. Birds of East Asia: China, Taiwan, Korea, Japan, and Russia. Princeton University Press.
• Gibson, D. D., and Byrd, G. V. 2007. Birds of the Aleutian Islands, Alaska. Nuttall Ornithological Club and the American Ornithologists’ Union. Series in Ornithology 1.
• Gibson, D. D., and Kessel, B. 1997. Inventory of the species and subspecies of Alaska birds. Western Birds 28:45-95.
• Lehman, P. E. 2005. Fall migration at Gambell, St. Lawrence Island, Alaska. Western Birds 36:2-55.

I’m currently on board the NOAA Ship Oscar Dyson in the Bering Sea. The last few days in the eastern Bering Sea have produced some interesting birds. In addition to the usual variety of tubenoses, alcids and larids a number of southbound migrants have passed the ship this week. Some are birds that have adapted to long, non-stop ocean crossings, others are not…

Bristle-thighed Curlew Numenius tahitiensis, Eastern Bering Sea, 30 August 2010.

Highlighting the list of fly-by appearances was this lone Bristle-thighed Curlew. It flew in to the stern of the ship, checked us out, gave a few whistles and flew off. Although the pictures are marginal you can still make out the warm tones to the underparts and the diagnostic mark–the peach-colored rump which appears contrastingly pale in the last photo.

Ruddy Turnstone Arenaria interpres, Eastern Bering Sea, 30 August 2010.

Ruddy Turnstones have been regular this week with at least one small flock approaching the ship every day. Today (8/30) we recorded over 20 individuals in several small flocks. Other shorebirds seen from the ship today were Pacific Golden-Plovers (4), Bristle-thighed Curlew (1), and Red Phalarope (100′s). Three Wandering Tattlers have flown by the trip since the we left Dutch Harbor on 17 August. Mind-boggling to think that the tattlers, turnstones, plovers and curlew may be in Hawaii or further before this ship get’s back to Dutch Harbor!

A Piscivorous Golden-crowned Sparrow Zonotrichia atricapilla, on board the Oscar Dyson in the Eastern Bering Sea 30 August 2010.

This Golden-crowned Sparrow landed on the ship on yesterday and was still here today. He’s been eating, or attempting to eat, juvenile Pacific sand lance Amodites hexapterus which the NOAA scientists have been catching on their surveys. A new food item for the species?

Orange-crowned Warbler Oreothlypis celata, Eastern Bering Sea, 25 August 2010.

This Orange-crowned Warbler only spent a few hours on board. (Note the change to the genus. Click here for info on other changes and updates to the AOU checklist.)

Yellow-rumped Warblers Dendroica coronata, Strawberry Hill, Dutch Harbor, 17 August 2010.

I had about an hour today to head back to Strawberry Hill, Dutch Harbor, before I had to return to the NOAA Ship Oscar Dyson in time to leave on a cruise in the southern Bering Sea. Yesterday’s Fox Sparrows were still present and were trumped today by two Yellow-rumped Warblers! The first warbler was with the Fox Sparrows on the top of the hill. The second was in the tall spruce trees that border the small lake just south of the hill.

Gibson and Byrd (2007) list Yellow-rumped Warbler as “casual in fall in eastern, central and western Aleutians.” The first records for Unalaska/Dutch Harbor were one at Strawberry Hill on 22 September 2009, followed by one on the hill on 10 October 2009 and two at the Sitka Spruce Children’s Park (near Strawberry Hill) on 11 October 2009.

A lone Bank Swallow flew by me on my walk back to the ship.

• Gibson, D. D., and Byrd, G. V. 2007. Birds of the Aleutian Islands, Alaska. Nuttall Ornithological Club and the American Ornithologists’ Union. Series in Ornithology 1.

Fox Sparrow Passerella illiaca unalaschensis, Strawberry Hill, Dutch Harbor, 16 August 2010.

My favorite thing to do in Dutch Harbor/Unalaska is to bird the planted sitka spruce trees around the town. The best group of trees is the robust stand that grows in a protected gulley on the top of Strawberry Hill. Many, many good birds have been found in this migrant trap over the years including a number of island firsts and a few firsts for the Aleutians! Nearly every trip through the stand has a surprise. This time it was a trio of adult Fox Sparrows–the first I’ve seen on the island. Although this race of Fox Sparrow (unalaschensis) was first collected at Unalaska Island, it is “extralimital at the type locality.” (Gibson and Kessel 1997). The western limits of its range are the alder thickets of Unimak Island, the first island in the Aleutians. Gibson and Byrd (2007) remark that the species is “casual or intermittant in spring and summer in eastern Aleutians beyond Unimak Pass” where it’s preferred habitat doesn’t exist.  Breeding east of Unimak was first suspected in 2003 when a “full-tailed juvenile” was found at Unalaska, but wasn’t confirmed until very recently by local birder Suzi Golodoff and visiting bird guru, Rich MacIntosh.

Pacific Wren Troglodytes pacificus kiskensis, Stawberry Hill, Dutch Harbor, 16 August 2010.

Also present on Strawberry Hill was a regular resident and breeder on the island–the Pacific Wren, or Winter Wren T. troglodytes as it’s now known by the American Ornitholgists’ Union. It was split from the Winter Wren (which occurs in eastern North America, on the basis of vocalizations and mitochondrial DNA differences. Click here for details of this and other revisions to the AOU Check-list.

Other birds of note yesterday were three Bank Swallows still flying over town. This is just a few days shy of the late date for the Aleutian Islands.

• Gibson, D. D., and Byrd, G. V. 2007. Birds of the Aleutian Islands, Alaska. Nuttall Ornithological Club and the American Ornithologists’ Union. Series in Ornithology 1.
• Gibson, D. D., and Kessel, B. 1997. Inventory of the species and subspecies of Alaska birds. Western Birds 28:45-95.

Now that the frenetic spring and summer breeding season is over and my schedule has eased up I have some time to post photos of this summer’s adventures. One of the highlights of my summer was a short trip that Bob Dittrick and I took to a nondescript ridge called Deadhorse Pass on the Eureka Road off of the Elliot Highway. We had just returned to Fairbanks after a three week stint in the Arctic National Wildlife Refuge and had only two days break in the schedule before Bob headed back into the Refuge and I headed for Nome.

The Eureka Road is about a three hour drive north and west of Fairbanks and is the location of the first Yellow-bellied Flycatcher nest found in Alaska. Yellow-bellied Flycatchers have been recorded irregularly in the spring in east-central Alaska for a number of years (mostly singing males). The species has also been caught at banding sights in Fairbanks and Tetlin National Wildlife Refuge. The Eureka Road population was discovered in 2004 and was nicely written up in Western Birds volume 37, number 1 which you can find here:

Martin, P. R., Bonner, F., Gibson, D. D. 2006. First Nest of the Yellow-bellied Flycatcher for Alaska with Notes on Breeding Biology. Western Birds 37:8-22.

We arrived on the ridge around 4 PM on July 3rd but the only empid that we heard that afternoon was a Hammond’s Flycatcher–one bird called once. We birded the rest of the afternoon and finally hit the sleeping bags around 11 PM. At 2:16 AM we awoke to the whine of mosquitoes and the distinctive song of the Yellow-bellied Flycatcher! Despite the very encouraging start to the early morning we did not get satisfactory views of the bird until around 7:30 AM when I managed these photos.

The bird spent much of the morning calling from dense trees for about 10-15 minutes at a time before going completely silent. After about 20-30 minutes of silence we would again hear it from an entirely different locations some distance away. So went the morning until after about five hours with only brief views of the bird we began to discern a pattern to its circuit. We finally parked ourselves on a patch of mossy slope and waited near one the stands. After about 30 minutes (I fell asleep) Bob spotted the bird in the open and its distinctive song jarred me from my sleep. We watched the birds until around 9 AM and enjoyed great views. We were able to snap a few photos and get comparison looks of Hammond’s Flycatcher as well.

In contrast, reports from birders who had visited the site earlier in the season reported having the birds singing and showing well at the pull-out where looks were easily obtained from the parking area. What a difference a week makes a to a flycatcher in July!

Sunrise circa 2:45 AM on the ridge. The Yell0w-bellied Flycatcher began singing at 2:16 AM.

Yellow-bellied Flycatcher Empidonax flaviventris, Eureka Road, 4 July 2010.

Note the bold eye-ring, bic0lored bill, and yellowish wash to the belly and throat. The song is diagnostic and this individual gave it’s clear “chebunk” call throughout much of the morning.

There was at least one other calling Yellow-bellied Flycatcher in the area as well as a Hammond’s Flycatcher E. hammondii and several Alder Flycatchers E. alnorum. The Alder Flycatchers were in thicker shrub on the other side of the ridge, but the Hammond’s was in the same area as this Yellow-bellied and when the two would come into contact the Yell0w-bellied would aggressively chase the Hammond’s away. The Hammond’s was noticeably grayer overall with less contrast between the wing coverts and the back and lacked yellow on the underparts. The bill of the Hammond’s Flycatcher was distinctly shorter and narrower, looking dainty when compared to that of the Yellow-bellied. The distal half of the lower mandible was dark. We heard the Hammond’s call only a few times throughout the morning, but whenever it was near the Yellow-bellied Flycatcher’s favorite stand of trees it was silent and in all interactions between the two the Yell0w-bellied aggressively drove the silent Hammond’s away.

White Admiral Limenitis arthemis, Eureka Road, 4 July 2010.

By 8 AM the sun was out and this beautiful White Admiral was sunning itself in the Yellow-bellied Flycatcher habitat.

• Click here for a report and photo of a “new” Yellow-bellied Flycatcher site discovered on the Steese Highway near Fairbanks in June 2010.
• Click here for detailed directions to the Eureka Road as well as more information on the Steese Highway Yellow-bellied Flycatchers.