Late summer is enlivened for me by the ripening of wild
fruit and the appearance of the fruit-eating bird in our local gullies and
thickets. These berry thickets, found throughout the Valley, provide birders with exciting birding opportunities during otherwise quiet times.
The classic berry thicket in the North Okanagan grows around
almost any drainage, pond or lake, or often in a narrow dry grassland swale that may once have channelled glacial water thousands of years ago when the surrounding ice sheets
were melting. Now the folds of the drainage contain bushes and short trees that provide birds and
animals with an annual summer feast. Drawn by the bounty, species like Swainson’s
Thrushes and Western Tanagers, normally hidden in upland forests, become temporarily abundant and
often more visible than usual as they strip the berries from the bushes.
The major fruit and berry species include Saskatoon, hawthorn sp. , Chokecherry, Pin Cherry, Red-osier Dogwood, and Blue Elderberry. Trees attractive to birds
and found growing around the berry thickets include Douglas Maple, Trembling
Aspen and Douglas-fir.
Birds drawn to such places include Ring-necked Pheasants,
California Quail, Ruffed Grouse, Mourning Doves, Calliope Hummingbirds, Rufous
Hummingbirds, Black-chinned Hummingbirds, Red-naped Sapsuckers, Northern
Flickers, and Pileated Woodpeckers (attracted, in particular to the fruit of
Virginia Creeper). Taking advantage of open perches and easy access to flies
and to flying insects are Western Wood-Pewees, Willow Flycatchers (open, marshy
habitat with red-osier dogwood thickets), and various empidonax species. Most prominent of the flycatchers are Eastern Kingbirds initially in family groups and later in autumn flocks fond of the white Red-osier Dogwood berry. Occasionally even a silent Olive-sided Flycatcher or two,
down from the mountain forests, may appear on its way south.
Hawthorns (Crataegus sp.) are principally eaten by Cedar Waxwings. Photo by C. Siddle. |
Vireos are typical berry thicket birds and are easily attracted by pishing. There is something in a vireo’s personality
that will not let the bird pass by a good pish without investigating. Cassin’s
Vireos, whether in molty plumage early in August or in feather perfect plumage
later in the month, can be counted on to appear, while it’s a rare Red-osier Dogwood thicket that doesn’t hold at least one Warbling Vireo. Red-eyed Vireos
are more conspicuous in mid and late August than at any other time as they fuss
and scold their way south from thicket to thicket.
An interesting thing about Warbling Vireos is that for 10 months of the year the species is highly insectivorous. Only in August and September does the Warbling Vireo consume fruit.
House Wrens are common in family groups, the young birds still showing fleshy gapes at the corners of their beaks, while Ruby-crowned Kinglets don’t usually begin to appear in numbers in the valley bottom until September.
House Wrens are common in family groups, the young birds still showing fleshy gapes at the corners of their beaks, while Ruby-crowned Kinglets don’t usually begin to appear in numbers in the valley bottom until September.
Swainson’s Thrushes, along with American Robins and Cedar
Waxwings, are the poster birds for these berry-bird aggregations. Coming out of the forest proper beginning in late July to feed in the thickets of the gulleys and draws, Swainson's Thrushes remain shy, only occasionally appearing at the edge of vegetation but commonly calling softly "whit" notes that reveal their presence. From mid September onwards Hermit Thrushes, that spent the spring and summer nesting in the boreal forest zone from about 1500 m and higher above sea level, replace Swainson’s in the more heavily wooded thickets though
never in such large numbers.
A Red-eyed Vireo responds to my pishing. Photo by C. Siddle. |
Swainson’s Thrushes call a diagnostic soft "heep" as
they cross the night sky during nocturnal migration. It was one of my favourite
sounds when I was a teenager in Mission, B.C. running home from a friend's house to make my schoolnight curfew. Overhead invisible in the inky sky Swainson’s
Thrushes also hurried on their way. Nowadays it’s a rare night that things are quiet
enough for my old ears to hear Swainson’s Thrushes still calling their muffled "heeps". Mostly the road past our house is a longitudinal din, what with rednecks
tromping the accelarators of their jacked-up pick-ups, and plump boomers
seeking the thrill of the open road in their loud fatly flatulent Harrys.
Just as Warbling Vireos are inseparable from Red-osier Dogwoods, so Gray Catbirds love their Blue Elderberry bushes. But catbirds in
late summer are apt to pop up almost anywhere even occasionally in suburban yards.
Gray Catbirds and Blue Elderberries (Sambucus racemosa). Photo by C. Siddle. |
European Starlings and Cedar Waxwings are among the most
conspicuous of the berry eaters, perching atop snags where they can
command a view of their surroundings. The sharp notes of a starling are often
the first warning that a predator has been spotted, for the berry aggregations
attract not just songbirds, but predators like Merlins, Sharp-shinned Hawks and Cooper’s Hawks.
By late August Orange-crowned and Yellow-rumped warblers
will be seen passing through the gulleys among the fruit eaters. Occasionally a
skulking MacGillivray’s Warbler will be among them. Around the drowned sticks and thickets aurrounding waterbodies a
Northern Waterthrush, a bird that used to regularly breed in riparian tangles
along the Valley bottom but which now is mostly restricted as nesting bird to
high elevation ponds, may give its sharp, loud call note as it constantly dips its hind end and climbs amid the stalks above the water. Wilson’s Warblers are also high elevation nesters but pass through the Valley at almost all levels on their way south, bright yellow birds among the many shades of green shadows around the thickets.
The Western Tanager is a common fruit-eater, coming out of the forest like the Swainson's Thrush to reap the benefit of the berry bushes. Don't expect to see the yellow and black males (wearing a small red cap in the spring) however; most late summer and autumn Westerns are studies in green and yellow.
Spotted Towhee in molt from its brown sparrow-like plumage (seen on its head in this case) and its more adult like black, white and rufous. Photo by C. Siddle. |
Towhees stay in the same brushy habitat throughout their spring-to-fall residency in the Okanagan so it's not surprising that they are seen in the fruit thickets. Juvenal Spotted Towhees, initially streaked like overgrown Song Sparrows, molt into new sets of adult-like
feathers while juvenal Chipping Sparrows, among the most common of mid-August
sparrows, shows streaked underparts until they molt into the plain unstreaked
gray chests and bellies of their immature plumage.
Cassie's Finch gobbling Saskatoon berries halfway up Silver Stare Mtn, .late July 2017. Note how the squashed fruit obscures the beak, possibly even temporarily staining it. |
One or two Black-headed Grosbeaks can usually be found among
the hawthorns, while Lazuli Buntings like elderberries and are most commonly
seen in mid-to-late August in drab female-like plumage. House Finches are common and conspicuous atop
thickets but Cassin’s Finches are much more local and can look awfully scruffy and
confusing to birders at this time of year. Finally, completing the suite of
birds of the gulleys and thickets of late summer, are American Goldfinches,
always present where there is water for them to drink and bath in.
Some thicket sites where birding can be rewarding:
NORTH OKANAGAN
Gray Canal Trail – Vernon
Gray Canal Road
Glenhayes Rd – Gray Canal section
Goose Lake – Vernon
Kalamalka Prov. Park – thickets around Cosens Bay
Southern sections of Otter Lake Rd – toward Armstrong
Desert Cove Estates – along Deep Creek
LAKE COUNTRY
Beaver Lake Road – access to best habitat limited
Winfield Creek Preserve
CENTRAL OKANAGAN
Chichester Wetland Park
Railway tracks behind Scandia – Kelowna
Mission Creek Regional Park – Sutherland Hills division
SOUTH OKANAGAN
White Lake Road between St. Andrews and the Observatory
Sawmill Lake
McIntyre Road, Vaseux Lake
The interactions of birds and berries is an intricate subject with many features that I have not touched upon in my superficial introduction. If you are interested in exploring the topic, try Birds and Berries: A Study of an Ecological Interaction by Barbara and David Snow. 1988. T&A.D. Poyser, Town Head House, Carlton, Waterhouses, Staffordshire, England.
The interactions of birds and berries is an intricate subject with many features that I have not touched upon in my superficial introduction. If you are interested in exploring the topic, try Birds and Berries: A Study of an Ecological Interaction by Barbara and David Snow. 1988. T&A.D. Poyser, Town Head House, Carlton, Waterhouses, Staffordshire, England.
Juvenal Lazuli Bunting. Photo by C. Siddle. |