Mourning Doves



Pair of Mourning Doves on the snow at the Montezuma Audubon Center

At bird feeders, they’re unmistakable. Small head, large buff-colored body, grayer on the wings and back, long-pointed tail with white along the edges… They prefer to feed on the ground, usually in small flocks, but if there’s enough room they’ll land on a platform feeder. When they take off, the whistling of the wings is diagnostic. In the morning, flocks try to catch the early rays of sunlight by lining up on utility wires strung between poles along country roads. We are of course talking about Mourning Doves (Zenaida macroura), named for their sorrowful cooing sometimes mistaken for the call of an owl.

Doves are the preferred prey of the Cooper’s Hawk, that long-tailed, short-winged, fast and maneuverable accipiter that visits our bird feeders. The doves, related to domestic pigeons, are mainly vegetarian. You may see a flock picking up wasted grain in a winter cornfield if there’s not much snow, but they also eat seeds from grasses and weeds. A few insects are fed to nestlings during the warm months. In late summer they eat the dark-purple, almost black, berries of pokeweed. Many doves head south to other agricultural areas for the winter, and a few birds banded in New York have gone as far as the Gulf-coast states.

In March, watch for them to begin pairing up as they prepare for a long nesting season, and listen for their "song," a series of five coos with the second one rising and falling. Once they set up housekeeping, a skimpy handful of loose twigs barely qualifies as a nest and it looks like the eggs are in danger of falling through or rolling off. Mourning Doves nest repeatedly through the summer, and I’ve seen them sitting on eggs as late as October. That nest in one of our spruce trees may have been the fourth brood of the year. It’s a good thing, because half the chicks don’t make it out of the nest; they fall victim to various predators, both avian and mammalian. Of the half that survive the nest and fledge, three-quarters don’t make it to their first birthday. Past that point, only 5% of the adults make it to five years old or beyond.

Mourning Doves were historically birds of the Southern states. They adapted to rural farmland where there was a combination of grain fields and watering holes or slow creeks to get a drink twice a day. In the 1800’s Passenger Pigeons were the dominant bird in the forested Appalachians and north into New York, but that species was hunted to extinction. During the 20th century the Mourning Dove population began expanding northward until it reached an estimated 10 million birds in New York State. They can live on the edge [called an ecotone] between woods and fields, but they are absent from large tracts of continuous forest.

The Mourning Dove is named for its sorrowful cooing, which is sometimes mistaken for the call of an owl. -- © Dave Spier

To get an idea of the Mourning Dove's range, visit eBird's "View and Explore Data" page, click on "Range and Point Maps" and type in "Mourning Dove" [or just click the link].  You'll notice there's a concentration of sightings across the South, the Great Plains and the Eastern United States.  Zoom in for detail.  The process works for any species anywhere in the world, but many areas like Asia and Africa and much of South America still lack data.

Questions and corrections to northeastnaturalist@yahoo.com

Beaver Lake

One of the Eastern Gray Squirrels visiting the feeders at Beaver Lake Nature Center
 -- © Dave Spier

Beaver Lake -- © Dave Spier

Beaver Lake Nature Center west of Baldwinsville [Onondaga County, NY] is a favorite winter destination for several reasons. First, a long row of large picture windows overlook the feeders at the edge of a woodsy area. In addition to birds, there are the omnipresent Eastern Gray Squirrels, and you can view them from the comfort of a heated room. The second reason is a good system of trails for x-c skiers and snowshoers. For extended walks, there’s an easy, fairly-level, three-mile loop around Beaver Lake itself.  Boardwalks cross the swampy trail sections.

Boardwalks cross the wet trail sections -- © Dave Spier

Donna on the trail around Beaver Lake in December -- © Dave Spier

For more information on Beaver Lake Nature Center, including trail map, visit their website at Onondaga County Parks: http://onondagacountyparks.com/beaver-lake-nature-center/

A bench lets you take a break -- © Dave Spier

Questions can be sent to northeastnaturalist@yahoo.com

Beaver Lake from the loop trail -- © Dave Spier

White-throated Sparrows

I'd say this is an adult tan-morph White-throat based on The Sibley Guide to Birds, page 494.

White-throated Sparrows begin returning in October.  They spend the summer across much of Canada and the North Country, but for some of them, this is far enough south to endure the winter.  Many more go as far as the Gulf and Southern States.  A few western birds hug the Pacific coast in winter.

In the fall, it’s hard to find a good rendition of their song, likened to “Old Sam Peabody, Peabody, Peabody” (hence the nickname “Peabody-bird”).  Perhaps these are young birds, but they have until spring to get it right.  Of course if you’re a Canadian resident, they sing “pure sweet Canada-Canada-Canada.”  Up there it’s known as the Canada sparrow.

Likely a first-winter White-throated Sparrow in December (in an ornamental Serbian Blue Spruce) - © Dave Spier

As adults, this species comes in two genetically-based color races (a.k.a. forms, morphs, or phases) known as white and tan.  Adult "white-morph" birds have high-contrast black-and-white racing stripes on the crown, yellow lores (the area between the eye and bill) and bright-white throats.  The adult "tan" race or version has brown and tan (or beige) head stripes, dull-yellow lores and a dull-white or light gray throat.  The differences have nothing to do with age or gender or geographic distribution as I understand it.  Both types are found mixed in the same population, a situation biologists refer to as polymorphism, or “many forms.”  That said, after the fall molt, the variation is less pronounced in their winter plumage.  To confuse matters, first-winter White-throats resemble the tan race, with lower-contrast head markings and a more-pronounced lateral throat stripe, a.k.a. malar-edge stripe or simply malar stripe.  Many field guides describe "bird topography" with illustrations of various field marks and their names.  In The Sibley Guide (the large, nationwide version), it begins on page 15, with the White-throated Sparrow as the example on page 16.

There are also behavioral differences.  White-morph males are more aggressive while tan females are better care givers.  Tan males and white females fall in the middle.  Ninety percent of the time, one color phase mates with its opposite and it is believed this balances their behavior characteristics.  After the young fledge from the nest, the brood is divided into two groups and each parent cares for only half of the fledglings.

White-throated Sparrows often associate with Dark-eyed Juncos, another type of sparrow.  Both species are ground feeders and at my house they clean up the sunflower seed dropped by the goldfinches, chickadees and other birds above them.  (With sunflower seed getting so expensive [about $25 per 50-pound bag, up from $11 a few years ago], I’ve taken some old metal garbage cans that rusted through on the bottoms, turned them upside down and placed screened tray feeders on top to catch the falling seed.  It used to pile up on the ground faster than squirrels, chipmunks, doves and other ground feeders could clean it up, and then the seed would mold and I’ve have to throw it away.  The screened trays allow precipitation to drain through on milder days, and the birds have a second chance to eat the seed.)

On rare occasions, White-throated Sparrows and juncos have been known to mate and hybridize.  [Off topic, we saw a pure-white junco when we were in Shenandoah National Park early in October.  It was hanging out with other juncos and a flock of Chipping Sparrows on their way south.]

During the summer, White-throated Sparrows consume high-protein insects, but the rest of the year they switch to a vegetarian diet consisting mostly of fallen seeds.  In the wild, they find their food by scratching through dead leaves and grass.  They also eat the fruits of dogwoods, cedars and spicebush.  These native shrubs and trees are plentiful at the Montezuma Audubon Center (MAC), but the sparrows have plenty of competition from thrushes and other berry-loving birds in the fall.  (The Audubon center also hosts a flock of American Tree Sparrows that over-winter in the walnut-grove thickets and brush piles.)   

White-throated Sparrows might be confused with White-crowned Sparrows which are also gray-breasted but lack the yellow lores and usually lack the white-throat.  In the fall, young white-crown’s resemble the color of tan-phase white-throat’s but have what I call a “butch-cut” or slight crest toward the back of the head.  Most of the white-crown’s are long-gone, having migrated farther south; they pass through about two weeks ahead of the white-throat’s.

A few White-throated Sparrows will stay here through the winter, but more return on their way north in the spring.  They stop for a few weeks in April and sing their characteristic song, well refined by then, before continuing north.

High-contrast, white-morph White-throated Sparrow in April with black and white "racing" stripes on the crown. - © Dave Spier

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The Largest Gull

Adult Great Black-backed Gull (December) -- © Dave Spier

The Largest Gull

© Dave Spier

The world’s largest gull, the Great Black-backed (Larus marinus), is a coastal species of the Northeast.  It breeds in the Canadian Maritimes, migrates through New England and now winters from the lower Great Lakes to the mid-Atlantic coast.  When I started birding in the early 70’s, it was still an uncommon visitor to the Lake Ontario shoreline, but its range has expanded southward from the original North Atlantic stronghold.

As the name implies, the gull’s wings and back are sooty-colored (more like slate than pure black).  The underparts are pure white, but in the winter, the white head exhibits some dusky streaking.  The legs are light pink and the adult’s bill is yellow with a red spot toward the tip of the lower mandible.  Sailors nicknamed these birds “the coffin carriers.”

Immature Great Black-backed Gull (January) -- © Dave Spier

It takes four years for Great Black-back’s to reach adulthood.  Young birds have light-colored heads that are more of a pale brown.  Their bills are dark and massive.  Wings and backs are relatively dark with a fine checker-boarded pattern.  The feet may be pink, but the legs start out as a dark bluish-gray.  A light rump accents a dark tail band.  Over the next several years, they gradually morph into the high-contrast adult plumage.

Adult Great Black-backed Gull eating a fish; note passing Wood Duck (October) -- © Dave Spier

Gulls, by their nature, are scavengers.  Their natural diet is dead fish and their job in life is to keep the beaches and shorelines clean.  Most gulls stick to this formula, but the GBBG, by virtue of its size, has discovered that it can become a predator.  I discovered this aspect many years ago when I was driving down the east side of Seneca Lake and noticed a Black-back attacking a small duck.  The victim was a female goldeneye that kept diving to escape, but every time it re-surfaced the gull would peck away at the bloodied duck.  As I recall, the goldeneye finally got away, or else the gull just gave up the struggle and went elsewhere for easier pickin’s.  In the “modern” world, easier often means garbage.  Depending on the season, they also eat fish, invertebrates (including insects), small mammals, eggs and carrion.  Given the opportunity, they will steal food from other gulls.

Adult Great Black-backed Gull eating a fish on the Erie Canal (February) -- © Dave Spier

In the late 1800’s, before protection was enacted, Black-backs were hunted to collect their feathers to supply the women’s hat industry.  The result was a population crash.  In the long run, their numbers have rebounded and continue to rise as their range expands southward.  This has become a new problem along the Atlantic coast where the gulls prey on colonies of terns and puffins.

Adult Great Black-backed Gull at Montezuma N.W.R. (October) -- © Dave Spier

          Corrections and questions may be sent to northeastnaturalist@yahoo.com  For more information about Finger Lakes birds and birding, visit the websites http://montezumabirding.webs.com and http://eatonbirds.webs.com

Letchworth Park (cont'd) -- © Dave & Donna Spier

Railroad bridge 234’ above the river at Upper Falls -- © Donna Mason-Spier

Train on railroad bridge 234’ above the river at Upper Falls -- © Donna Mason-Spier

[Part 1 of this article is the previous post directly below this one.]

Roughly 350 million years ago [during the Devonian period, named for Devon, England where rocks of this age were first studied], western New York was still submerged under an inland sea near the equator. Sediments washing down from the Acadian Mountains to the east continued to fill the basin with layer upon layer of deposits that solidified into a thick sequence of shales, siltstones and sandstones now partially exposed in the Letchworth gorge. [For comparison, older rocks deeper in the Catskill Delta are exposed at Taughannock Falls State Park, profiled in an earlier blog (see October 27). The Tully limestone at the base of the Taughannock gorge formed as a shallow reef near the edge of the inland sea between Middle and Upper Devonian time.]

Rainbow in the mist below Upper Falls -- © Donna Mason-Spier

After exploring the Upper and Middle Falls, we drove north and briefly stopped at the Archery Field Overlook next to Great Bend canyon. Sometimes there are Turkey Vultures from the resident flock working the air currents, but today we didn't see a single one.

Great Bend canyon south from Archery Field overlook-- © Donna Mason-Spier

Great Bend canyon north from Archery Field overlook-- © Donna Mason-Spier

Our final stop of the day at Letchworth was Wolf Creek and a walk out to the point. Steep cliffs drop to the river below. A short spur trail to the south leads to a Red Pine barely clinging to the dry rim. Erosion has left the inner roots exposed at the base of the trunk.  In the park, Red Pine is at the northern limit of its range.

Red Pine on the rim near Wolf Creek -- © Donna Mason-Spier

Donna had predicted a nice sunset and sure enough we got one, although we had to detour to find an open view to the west-southwest.  After taking a few shots, we found a wet corner of the field with a nice reflection as the color began to fade.

Sunset from Freshour Rd. near Shortsville -- © Donna Mason-Spier

Letchworth Thanksgiving -- © Dave & Donna Spier

Trees on the canyon rim at Letchworth State Park, NY_© Donna Mason-Spier

This year’s Thanksgiving weather was pretty decent by western New York standards.  In fact, it's been the fifth warmest November on record.  Where we were, the weather didn’t live up to predictions, but we did get some sunny breaks in the afternoon between the morning cumulus clouds (probably coming off Lake Erie) and the evening cirrus coming in from the west that gave us a beautiful sunset to end the day.

Donna and I renewed our tradition of spending Thanksgiving in Letchworth State Park about midway between Rochester, NY and the Pennsylvania state line. After entering the park at the Mt. Morris [north] end, we drove the roughly 15 miles to the waterfalls near the south end. First stop was Inspiration Point which has heated restrooms open year round. There is a handicap-accessible interpretive trail along part of the rim and starting from the parking lot.

View from Inspiration Point -- © Donna Mason-Spier

At the end of the last Ice Age, glacial fill [clay, silt, sand and gravel that's part of the Valley Heads moraine] blocked the return of the Genesee River to its ancestral valley just northeast of Portageville at the south end of the park. The river was forced west to the lowest divide and there it cut a new channel and began carving canyons through solid rock. A series of three waterfalls continues to deepen the gorge as they erode upstream [southward]. At Inspiration Point a short walk takes you to an overlook with a distant view of the Middle and Upper Falls.

From there we backtracked slightly to a side road and a short drive to Trailside Lodge for a picnic lunch.  Some years we have a little company; this year we had it all to ourselves. There are lots of tables inside, the building is heated and it turns out there are heated restrooms there too.  Our more-regular Thanksgiving dinner would be later at home.

Fireplace inside Trailside Lodge where we ate a picnic lunch -- © Dave Spier

District #2 schoolhouse beside the road to the trout pond -- © Donna Mason-Spier

Cross-bedded sedimentary rock layers on a natural joint plane [roadcut beside main park road] -- © Donna Mason-Spier

After lunch, we continued south with a brief stop at the old schoolhouse near the Trout Pond and then down the hill past Glen Iris to a one-way drive descending to the old flood plain and a choice of parking areas. Our first direction was a short walk south to the Upper Falls which was nearly obscured by spray and mist rising from the plunge pool. It’s difficult to see, but the caprock is 28 feet of Nunda sandstone supported by weaker Gardeau sandstones and shales. Both formations are part of the late-Devonian West Falls group which in turn is part of the larger Catskill Delta underlying the Finger Lakes and Genesee regions. 

Trail to Upper Falls -- © Donna Mason-Spier

Deh-ge-wa-nus Creek descends to the river above Upper Falls -- © Donna Mason-Spier

At Letchworth Park, you can walk uphill past the crest of the Upper Falls and look back to see a rainbow in the mist when conditions are right. The rainbow is highest in late fall and early winter when the sun is near its lowest angle of the year. In the afternoon, the rainbow is downstream from the west side trail.  If you go, you might want to also take some pictures of the historic 234-foot high steel railroad bridge. They're talking about replacing it with a modern arch bridge.

Rainbow in the mist below Upper Falls -- © Donna Mason-Spier

From the Upper Falls it’s an easy half-mile walk north along the Genesee River toward the Middle Falls, probably the most spectacular of the three falls and the main attraction in the park.  Along the way we stopped to take a few pictures of the river which was unusually high and muddy for this time of year due to recent heavy rains.

Ripples on the Genesee River above Middle Falls -- © Donna Mason-Spier

Outcrop in the Genesee River above Middle Falls -- © Donna Mason-Spier

First hint of rainbow in the mist below crest of Middle Falls -- © Donna Mason-Spier

 If you continue north on the trail past the crest you’ll reach clearer views of the falls itself. Watch for another rainbow in the mist along the way. William Pryor Letchworth built his Glen Iris mansion overlooking this falls. It descends 107’ over rocks of the Gardeau formation.

Middle Falls, 107’ high, seen from below William Pryor Letchworth's mansion at Glen Iris -- © Donna Mason-Spier

Rainbow in the mist below Middle Falls -- © Donna Mason-Spier

Letchworth Park blog to be continued...

(In the meantime, you might want to check the Genesee River Wilds Project working to develop a series of parks and trails along the river from Letchworth south to Potter County, PA.)

Ring-billed Gulls -- © Dave Spier

Juvenile Ring-billed Gull at Lakeshore Park (on Seneca Lake) in Geneva, NY [November] © Dave Spier

Gulls are commemorated by a statue in Salt Lake City for saving the day when they ate the insects plaguing early Mormons in Utah.  Less dramatic are the local flocks of gulls that follow plowing tractors to feast on fleeing insects and (I suspect) mice and other small creatures like earthworms.  Gulls’ diets benefit in other ways from human activity.  To see this, just visit a landfill (unless they have trained falcons to patrol the skies).  The gull’s natural role in nature is being a scavenger cleaning the beaches of dead fish, but in reality these birds are omnivorous.

There are three gull species likely to be found in the Finger Lakes region and Lake Ontario during the winter.  Of these, the smallest and probably most numerous is the Ring-billed Gull (Larus delawarensis), sometimes nicknamed the “parking lot” gull.  It’s the one most adapted to life inland away from the sea.  It’s named for the black ring near the tip of the adult’s yellow bill.  Young ring-bills have a pink or flesh-colored bill with a black tip and we’ll discuss other differences.

Juvenile Ring-billed Gull at Lakeshore Park (on Seneca Lake) in Geneva, NY [November] © Dave Spier

Ring-bills require three years to reach maturity.  First-winter birds resemble very dirty adults with dark bars beside the chest, dark streaky heads, spotty sides, mottled brown areas on the wings and a black band across the end of the tail.  The legs are pinkish, unlike the adults yellow legs, but the backs are starting to turn gray.  Second-winter birds are much more adult-like overall.  In addition, legs become pale grayish-green or yellowish and the dark band at the end of the tail becomes broken and thinner.  By the third winter, the gray mantle extends across the back and upper wings -- except for the ever-present black wing tips.  The tail is now all white.  After the first winter, all non-breeding gulls show a little brown on the back of the head.  After adults molt to spring breeding plumage, this brown tinge disappears and a red orbital ring becomes more prominent around the pale eye.  Adults show a white spot at the end of sharply-contrasting black wingtips.

Adult Ring-billed Gull at Lakeshore Park (on Seneca Lake) in Geneva, NY [November]
© Dave Spier

The natural range of the Ring-billed Gull is transcontinental from the Canadian Maritimes to the Pacific Northwest.  Most of these birds travel to the southern states and coastal areas in winter, but the Lower Great Lakes and St. Lawrence Valley are mild enough with open water to hold a sizeable population throughout the year.  Ringbills seem to be born with a magnetic sensitivity that would take them in the right direction for fall migration.

Mixed-age Ring-billed Gulls at Sodus Point on Lake Ontario, NY [November] First-fall juveniles bottom center and lower left, 2nd-fall juvenile at right [based on The Sibley Guide to Birds]  - © Dave Spier

Ringbills prefer to nest on islands away from predators, and they will return to the same nest sites year after year if conditions permit.  This behavior is called site fidelity.  They nest in colonies limited only by the size of available habitat.  Given how common and widespread the species is now, it’s hard to imagine that they were once extirpated from parts of their range as a result of hunting for the millinery (hat) trade in the 1800’s.  Their breeding range is again expanding.

Many of these birds also return to the same wintering locations year after year.  If it worked once, it’s likely to work again in terms of finding food and shelter.

Occasionally a few Bonaparte’s Gulls will spend the winter along Lake Ontario.  This fourth species is smaller than the ringbill, has pink legs, a thin black bill and sports a dark “ear” spot behind the eye.  During spring and summer, adult Bonaparte’s have a black head.

As time permits, I’ll talk about the two larger common gulls.
Questions and corrections may be sent to northeastnaturalist@yahoo.com