A Great Year for Warbler-Watching

2012 continues to be an excellent year for observing warblers in Manhattan. An ardent birder (with flexible hours to leave work and chase rarities!) would have had multiple chances to get 35 of the 36 warblers that regularly pass through Manhattan in either spring or fall migration, and one chance — this last Wednesday the 19th in Strawberry Fields — to get the remaining one, the Golden-winged Warbler. [Note that after this entry was published, another Golden-winged appeared briefly on September 29th in the Maintenance Meadow.] The complete list:

1 Ovenbird
2 Worm-eating Warbler
3 Louisiana Waterthrush
4 Northern Waterthrush
5 Golden-winged Warbler
6 Blue-winged Warbler
7 Black-and-white Warbler
8 Prothonotary Warbler
9 Tennessee Warbler
10 Orange-crowned Warbler
11 Nashville Warbler
12 Connecticut Warbler
13 Mourning Warbler
14 Kentucky Warbler
15 Common Yellowthroat
16 Hooded Warbler
17 American Redstart
18 Cape May Warbler
19 Cerulean Warbler
20 Northern Parula
21 Magnolia Warbler
22 Bay-breasted Warbler
23 Blackburnian Warbler
24 Yellow Warbler
25 Chestnut-sided Warbler
26 Blackpoll Warbler
27 Black-throated Blue Warbler
28 Palm Warbler
29 Pine Warbler
30 Yellow-rumped Warbler
31 Yellow-throated Warbler
32 Prairie Warbler
33 Black-throated Green Warbler
34 Canada Warbler
35 Wilson’s Warbler
36 Yellow-breasted Chat

Starr’s walks have produced 34 warbler species, an stellar total with plenty of chances left to see the other two (Golden-winged Warbler and Connecticut Warbler, both fall migrants that have appeared within the last week in Central Park).

Of course, some warblers are more common than others. The eBird site allows you to graph the “frequency” of bird species in a given area. The “frequency” of a species is defined as the percentage of lists submitted in a given week on which the species appears.

For a common warbler, consider the Yellow-rumped Warbler. It’s peak frequency occurs historically the first week of May, when 69% of birder-submitted lists have at least one Yellow-rumped on them.  Think you’ve seen a lot of American Redstarts lately? This is no surprise, as the Redstart has its peak frequency of 68% during the second week of September.

A warbler of mid-range rarity is the Chestnut-sided Warbler, which peaks at about 30% in the spring and 23% in the fall. Another would be the Black-throated Green Warbler, a bit easier still at 43% in the spring and 24% in the fall. The Nashville Warbler peaks at 31% during the first week of May and 9% during the fall.

Now for the hard warblers. Most of these are rare enough to merit a text alert to NYNYBIRD or a posting on ebirdsNYC. The Cape May Warbler peaks at 17.6% during the second week of May. The Bay-breasted Warbler peaks at 13.4% in the third week of May. Neither gets above 3.4% during the fall season. The Blue-winged Warbler only peaks at 12.9% in the spring, in the last week of April, yet most would consider it a much easier find than the other two. I certainly would not put out an alert on it in season.

Other hard warblers would be the Blackburnian Warbler and the Prairie Warbler — both peak at around 23% in the first week of May and do not get above 6% in the fall.

The Hooded Warbler is very hard to get. It peaks at 7% during late April and early May, and less than 3% in the fall. The Mourning Warbler peaks at 6.7% in the spring and is little-seen in the fall (at least until this year). The Worm-eating Warbler is only a tad easier (using pre-2012 records), peaking at 10% in the first week of May. This year a very cooperative Worm-eating Warbler hung out in the Upper Lobe from early July through early September, making the species appear much more common than it usually is.

The six toughest warblers are rarer still. Some are not recorded every year in Central Park. Here they are, along with their peak frequencies:

1 Prothonotary Warbler 4.5
2 Cerulean Warbler 4.5
3 Yellow-throated Warbler 3.5
4 Golden-winged Warbler 2.9
5 Connecticut Warbler 2.4
6 Kentucky Warbler 2.2

Starr’s walks have had four of these six!

What makes 2012 so unusual is that many of these rarest warblers were reported frequently and seen often. Prothonotary Warbler was reported at least five times in Central Park (the first one occurred on Starr’s walk and our group was treated to great views in the Loch), and there was a Prothonotary that lingered at Bryant Park for over a week. Cerulean Warbler was reported four times in Central Park (one was found by Starr by the Meer) and once in Riverside Park. Yellow-throated Warbler had a widely-seen appearance in Riverside Park and at least two others in Central Park (Starr helped re-find the first one in Central Park and many in her group got to see it). A Kentucky Warbler lingered around the Shakespeare Garden area for over a week beginning in late April; another appeared in May in the North End. In late August, yet another lingered by the Loch. This is amazing, considering how many years that the Kentucky Warbler does not appear in Central Park at all. And yes, our group got to see the Kentucky Warbler at both ends of the Park.

Just a week ago a Connecticut Warbler was sighted on the lawn in Bryant Park, offering great, unobstructed views to those many who responded to the bird alert quickly. Prior to that there were two other Central Park reports in which the bird was seen only briefly by a single reporter. Then this morning, Sunday, September 23rd, another was found in Tupelo Meadow. Over 30 birders assembled and waited 90 minutes for the bird to reappear, after which they saw it walking through the tall vegetation just north of the meadow.

So what’s going on? Why so many more observations of rare warblers? We should not be too quick to extrapolate from one year of experience and a handful of sightings. It is possible that some species are responding to climate changes with different migration paths. I am not qualified to speak to this issue.

I do know that more birders are embracing technology and reporting what they see. They post their lists to eBird, which not only does a super job of organizing what they’ve seen but also allows other birders to immediately learn of rarities as soon as they are reported. They post to local news groups such as eBirdsNYC and state-level boards such as the one run now by the American Birding Association for New York, formerly called Birdingonthe.net. Those with smartphones can post right from the field. So, though there may not be more rare birds, there probably are more reliable rare bird reports than ever before.

Not only do more birds get reported publicly but also reports are timelier, allowing more birders to get to the bird before it flies away. The fastest and simplest system for Manhattan birders is NYNYBIRD, which works with any cell phone that can send and receive text messages. Within seconds of a sighting you can alert all subscribers as to what you saw and where you saw it. This morning’s Connecticut Warbler was reported on NYNYBIRD, and within ten minutes dozens of birders had arrived in Tupelo Meadow to see it. A fuller explanation of NYNYBIRD can be had here.

2012 is giving Central Park birders many rare and memorable sights. Starr and Lenore look forward to helping you enjoy more of them in the coming month.

Good birding,

David Barrett

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30 April 2012: Yellow-throated Warbler at Azalea — and More!

Yellow-throated Warbler (photo by John Van de Graaff, Port Aransas, TX)

White-eyed Vireo (Vireo griseus)

White-eyed Vireo

Somewhat warmer conditions, sunny skies, and calmer winds helped deliver our best day in the Central Park Ramble this season. We had 54 total bird species including 12 warblers and 5 new birds for the year.

Soon after the walk began Starr heard a Tennessee Warbler singing near 78th and Central Park West. All heard it sing more, though we were unable to see it. It is a first-of-season for the group.

Along the walk toward Maintenance Meadow we had many of the birds that have been appearing commonly of late, such as Chipping Sparrow, Blue-headed Vireo, Warbling Vireo, Brown-headed Cowbird,  Hermit Thrush, and House Wren.

Once in Maintenance Meadow, we heard the song of a White-eyed Vireo coming from afar, but initially we could not locate it. As some headed for the restrooms, your webmaster found it in the trees just east of the men’s room and many got good views. Then the bird went flew and went silent. About five minutes later it reappeared in the large tree at the NW corner of the Meadow, and Starr quickly got everyone on the colorful bird.

Turtle Pond provided many good birds: a Great Egret, a Chimney Swift flying low, a Barn Swallow and the group’s first visual of the season of two Tree Swallows.

On the path ascending toward Belvedere Castle, Starr noted the song of a Nashville Warbler (another first-of-season for us), but we could not get a glimpse.

Then I received a text message alert: Anthony Collerton had a Yellow-throated Warbler (extremely rare for Central Park) at Azalea Pond! After posting the group, I was at Azalea within a few minutes, but was met with a disappointed Mr. Collerton saying that the bird appeared to have flown. At least a dozen birders were already on the scene looking for it.

After about ten minutes Starr noted that the song coming from high in the trees could be from a Yellow-throated, and Doug Kurz soon re-found the bird and got us on it. Starr helped to describe its location, and many others got clear but fleeting views. Then the warbler moved. We continued to hear the song, but leaf cover made seeing it difficult. Nevertheless it was another first-of-season bird for us and easily the bird of the day!

As we wound our way through the Ramble, Roz and Starr pointed out a female Black-throated Blue Warbler.

Throughout the morning we often heard Warbling Vireo song, but near Swampy Pin Oak we finally were treated to an excellent view of one, soon joined by a Blue-headed Vireo. We also got a good view of a Northern Parula, another frequently-heard bird.

Upon entering the Point we saw heard and saw our first-of-season male Baltimore Oriole singing over the Oven.

A few steps further along I looked toward the Oven and saw a dark, thick bill extending away from a tree limb and then an orange-red eye: it was a Green Heron,

Green Heron (John Van de Graaff, Central Park Oven)

another first-of-season bird for the group. The heron almost immediately dropped into the Oven where none could see it. We went back out of the Point and from the west bank of the Oven all saw this handsome bird strutting in the mud.

Near Bow Bridge we heard and saw a Yellow Warbler.

At the north end of Strawberry Fields we first saw a singing Black-throated Green Warbler and then got excellent views of a bird that had previously been reported there throughout the morning: a male Blackburnian Warbler.

Blackburnian Warbler (photo by John Van de Graaff, taken near Point Pelee, Ontario)

We’re proud to exhibit the work of top bird and nature photographer John Van de Graaff who joined us for the walk today. Visit his website

www.birdsbyjohn.com

for more of his excellent photographs.

Migration clearly is stepping up and we look forward to more great mornings like this one!

14 April 2012: Three Falcons, a Savannah, and a Blue-headed Vireo

Blue-headed Vireo Vireo solitarius

Blue-headed Vireo

We had a very productive Saturday morning walk in the North End — 52 species, our highest one-day total for the season — including all three falcons generally seen in the Park.

A Peregrine Falcon flew overhead just as the walk was starting. About forty minutes later a Merlin briefly alighted atop a tree just south of the Great Hill. Soon afterward an American Kestrel flew over the Great Hill and then perched on the tallest nearby building on Central Park West.

Lenore spotted a Savannah Sparrow on the east area of the Great Hill, our first of the season, making it a eight-sparrow day (along with Field, Towhee, Chipping, Swamp, Junco, Song, and White-throated).

Between Huddlestone Arch and Lasker Rink, Starr heard a Blue-headed Vireo (also a first for the year) and soon we had good looks at it, along with a raccoon resting in the tree nearby.

Though not on the official walk, Starr did join some of her group to see the Yellow-throated Warbler in Riverside Park after the walk was over.

Highlights of the walk:

Ruby-crowned Kinglets, everywhere

Hermit Thrushes (plentiful)

Louisiana Waterthrush (2, Loch)

Palm Warblers (plentiful)

Yellow-rumped Warblers

Pine Warbler (Loch)

Blue-gray Gnatcatcher (Wildflower Meadow/Loch)

Blue-headed Vireo (Lasker Rink)

Winter Wren (Loch)

House Wren (Loch)

Carolina Wren

Savannah Sparrow (Great Hill)

Field Sparrow (Great Hill)

American Kestrel

Merlin

Peregrine Falcon

Brown-headed Cowbird (Loch)

Great Egret (flyover)

Northern Rough-winged Swallow

Brown Creeper (Loch)