Date: 1/10/19 5:54 pm From: Norman Levey <norman.levey...> [arlingtonbirds] <arlingtonbirds-noreply...> Subject: [Arlington Birds] Concord CBC - 20,082 American Robins
The Concord Christmas Bird Count, inaugurated December 31, 1960, is centered on a point where the towns of Concord, Sudbury, Stow, and Maynard converge, defining the center point of a circle that entirely or partially encloses eighteen towns. Our first count had 23 participants in six parties in Concord and a single volunteer in neighboring Lincoln. Modern participation levels fluctuate between 260 and 300 field participants and feeder watchers.
Several species seen on the first count such as ring-necked pheasant (94) and ruffed grouse (23) are all but totally extinct today. Evening grosbeaks were a common spectacle on feeder boards and crab apples every year, peaking at 1,672 in 1983; this year the irruption missed us entirely for a count of zero. Purple finch (12) and house finch (0) were reversed in abundance similar to mallard (2) and American black duck (20). Rarities on this prehistoric date were pileated woodpecker (1), tufted titmouse and Northern cardinal (Count Week only), and American robin (4) when the majority of our robins had highly migratory inclinations and the partial migrants and nomadic flocks we see on the count today were comparatively scarce. Red-tailed hawks (2) were soon to proliferate with the aging and expansion of suitable forestland nesting habitat and it is now a common sight to see one or a pair of red-tails soaring over every large agricultural field. Annual results have averaged 155 the previous 15 years.
Daylight parties pulled up their winter socks and set out early morning in bright, cool, and calm weather. Lakes and large ponds were open for business after an early December freeze-over and ducks had returned improving our species total from last year’s underachieving 78. Twelve of our 14 gadwall were scoped in a single flock with mallards by our Bedford sector leader. Hager Pond in Marlborough again delivered Northern shovelers, green-winged teal, and Northern pintails, but to our surprise and delight the Acton sector tallied 4 of the total 12. Way to go, Acton! Hager Pond’s annual overwintering American coot appears to have vanished. Bald eagles and peregrine falcons have to eat, too.
Speaking of BALD EAGLE, this year’s total, accounting for multiple counts and participation level, may have achieved a new high count of 14. Other records may be in the math for NORTHERN BARRED OWL (27), YELLOW-BELLIED SAPSUCKER (5 - a tie with one recent record), and possibly COMMON RAVEN (20) which is difficult to census because these intelligent and noble corvids show little respect for town sector borders and travel widely. But the most dramatic high is AMERICAN ROBIN (20,082) roosting in Wayland’s Wash Brook, smashing 2003’s previous record of 7,591 in Stow. European starlings (7,470) have also formed a roost in Wayland, nailing to the wall a ten-year record for these guys, but far from 1971’s 18,000 before large dairy farms vanished.
We have written the final chapter about the decline of herring gull on the Concord count and a record low count this year for the once abundant RING-BILLED GULL (48) is not an unexpected postscript.
Unusual records this year are warblers, including a first record PALM WARBLER that completed its migration early December on Pine Hill in Concord and was relocated and skillfully photographed by a member of the Concord College of Ornithology, which also turned up one of our two common yellowthroats. Wayland’s Wash Brook Rare Bird Detective Agency, which opens for business well before dawn when most birders have barely risen from their beds, located and photographed a YELLOW-BREASTED CHAT, a third record. The WBRBDA had previously eBirded the robin and starling roosts and turned up one of our three wintering gray catbirds. Dumetella, which means (in Latin I presume) “small thicket” is the genus name for this plain gray small-thicket bird with a black cap and rufous undertail that is perfectly happy to dine on oriental bittersweet fruit when little else is spread on winter’s austere buffet table.
Let us respect the bravery of these rare winter visitors and all the other birds and wildlife now settled into their winter home, for frigid wind and harsh weather and scarcity impose a cruel and unforgiving test of animal adaptation and survival.
Here is a special thanks to our skilled and ambitious young birders who join us every year and contribute their keen eyes, ears, and knowledge to the count because they are of course our future CBC counters and leaders and another extravagant thank you is offered to our sponsor, SUDBURY VALLEY TRUSTEES, and executive director Lisa Vernegaard who hosts our countdown and pot luck supper in SVT’s Wolbach farmhouse.
A first draft of our bird list is published below and our results illustrated with photographs, notes, and graphs will appear on our concordcbc.org Wordpress site.
Please join us again this year Sunday December 29, 2019 for another adventure in winter birding.
Norm Levey for the Concord CBC.
Canada Goose 3,017
Mute Swan 40
Gadwall 14 - (12 seen together with mallards in Bedford GM)
American Black Duck 50
Northern Shoveler 2 - show every CBC — usually on Hager Pond.
Northern Pintail 12
Green-winged Teal 2 - Hager Pond Marlborough
Bufflehead 5 - ponds and lakes open
Common Goldeneye 25
Hooded Merganser 25
Common Merganser 102 - a few reported in flight
Wild Turkey 210 - first in 1997 (9) to 323 by 2010
Great Blue Heron 8
Turkey Vulture 1
Northern Harrier 1
Sharp-shinned Hawk 13
Cooper’s Hawk 37
Bald Eagle 14 - New high count. May be a few double counted in this number. Five in Concord.
Red-shouldered Hawk 2
Red-tailed Hawk 186 - steady increase from 2 in 1960
Ring-billed Gull 48 - new low count
Herring Gull 22
Rock Pigeon 787
Mourning Dove 1,159 - H. D. Thoreau’s doves were likely passenger pigeons
American Tree Sparrow 349
Chipping Sparrow 4
Field Sparrow 1
Fox Sparrow 3
Dark-eyed Junco 2,733 - Almost 10,000 in 2009.
White-crowned Sparrow 1
White-throated Sparrow 365
Savannah Sparrow 9
Song Sparrow 421
Swamp Sparrow 21
Northern Cardinal 863
Red-winged Blackbird 199
Rusty Blackbird 1
Common Grackle 40
Brown-headed Cowbird 48
Baltimore Oriole 1
House Finch 660
Purple Finch 33 - I may hear from Jim Berry, but they are truly here this year.
Common Redpoll 6
Pine Siskin 20
American Goldfinch 1,290
House Sparrow 2,414
Total number of individuals - 52,518, a new count high by 163.
Total species - 88
Posted by: Norman Levey <norman.levey...>