Sedge Wren

The somewhat late arrival of sedge wrens this year at Goose Pond Sanctuary has not affected the overall numbers of this small bird.

The Birds of North America publication states that “The sedge wren appears to be one of the most nomadic terrestrial birds in North American with breeding concentrated in widely different portions of its range at different times of the breeding season.  A first period of nesting is concentrated primarily in the upper midwest (Wisconsin, Minnesota, North Dakota) and occurs during late May and June. A second, more widespread, nesting period occurs late in the summer (July-September) with birds expanding out into southern (Nebraska, Kansas, and Missouri) portions of the breeding range.”

At Goose Pond, we expect sedge wrens to return around the 4th of July.  We anticipated their return this year so we could confirm nesting for them in our Breeding Bird Atlas blocks.  However, while on a frog count at Goose Pond on July 14 at 10:30 p.m. we were listening to the calls of two Virginia rails when we heard our first harsh introductory notes followed by a slow buzzy trill of a sedge wren. Sedge wrens can call throughout the day and night.  

Goose Pond staffers Tony Abate and Maddie Van Cleve found four sedge wrens west of the pond the next morning. Two days later while working with interns in the Wood Family Prairie, nine male sedge wrens were counted and Tony spotted a bird carrying nesting material in its feet, a confirmation for the Arlington priority atlas block. Over the next few days we found sedge wrens present at many of our prairies including the Browne and Sue Ames Prairies.

In the first Atlas project, sedge wrens were found primarily in sedge meadows and in native and restored prairies that provide tall, dense habitat. Their close cousin the marsh wren is primarily found in cattail marshes.

In 1991, Sam Robbins listed the sedge wren as a common summer resident. He went on to mention that in 1911, Columbus area farmers reported that they saw “hundreds” of eggs” destroyed by machinery when cutting hay, most of which were likely to be the eggs of sedge wrens. Sedge wrens were probably “abundant” at the turn of the century.  

In 1999, the Fish and Wildlife Service “identified the sedge wren as a conservation priority in the Midwest due to its rarity and declining population.” Researchers believe that Wisconsin is in the center of the sedge wrens breeding range. There have been relatively few field studies of this species, and thus many aspects of its natural history remain poorly understood. It would be nice to learn why sedge wrens return in July to Goose Pond when they are reported to nest in Wisconsin in late May and June.

We invite you to visit Goose Pond in August to view your beautiful prairies and to search for the nomadic sedge wren.

Written by Mark Martin & Sue-Foote Martin

Photo by Arlene Koziol

 

Turkey Vulture

A dark, brooding, and indifferent bird, reading the wind like a well-worn novel, the muse of mortality. Taking a thermal, teetering against the wind, soaring in circles, the turkey vulture's mysticism is imagined from a dark and deceased place.

Turkey vultures projectile vomit to defend themselves from predators or intruders.

Edward Abbey imagined himself in “the fierce greedy eyes and unimaginable consciousness of a turkey vulture... soar[ing] on motionless wings high over the ruck and rack of human suffering. For most of us a promotion in grade, for some the realization of an ideal.” An accessible bird, vultures can easily be spotted soaring in the midday sun. Indolent up there, skimming thermals above it all, turkey vultures aren't difficult to track, and their dihedral V-shaped wings are diagnostic.

People often see vultures along the roadside, cleaning up carrion. Groups of turkey vultures last seen among the cumulus will congregate around deceased animals. The habit of scavenging may seem repulsive to some, but turkey vultures play an important ecological role. They clean the earth of its dead flesh. Able to metabolize biotoxins in decaying animals, turkey vultures filter the right-of-ways of roads across America, roads so ubiquitous that it is more accurate to talk about where roads aren't (“roadless areas”) than where they are. The vehicular swarm covering the continent bodes well for vultures, since animals end up crossing these roads for resources or migration. An animal that has crossed enough roads will eventually meet its Buick; until then the turkey vulture waits.

On a warm summer day I trudge into an old field in the process of being converted to tallgrass prairie. Over the stubble of a soy field comes a turkey vulture, flapping its wings as it rocks to the east. I've never seen a vulture work so hard. It flaps its wings hard, rising above the soy and fencerows. Ambition, perhaps, or the bird found something interesting, maybe even edible.

A sharp sense of smell allows the turkey vulture to identify sources of prey. One of a few birds with olfactory expertise, turkey vultures can be alerted to dead flesh by as little as a few parts per trillion in the air. For this reason, black vultures, which lack a developed sense of smell, will follow turkey vultures to a carcass and harass the turkey vultures away from the prize.

In Texas, researchers at the Texas State Forensic Anthropology Research Facility are using vultures for a unique reason: to solve crimes. In a delusive field in Texas, researchers have scattered remains throughout the bluestem and mesquite of the Texas blackland prairies. Theses remains that they've scattered are human. Hoping to nail down the chronology of a crime, turkey vultures could help solidify a timeline, and this research is helping to better identify subjects as they decompose. Dirty work, but work the turkey vulture is cut out for.

The avoidance of death and dead bodies in western cultures wasn't always that way. Up to and even beyond the nineteenth century, churches and crypts in Europe were sometimes decorated with human bones, known as ossuaries, sublime art that provided a link to the dead. Linked with dead bodies, turkey vultures loiter in the land of Poe and Hollywood horror.

Yest, many cultures still revere vultures as a necessary and welcomed birds. Its scientific name (Cathartes aura) means “purifying breeze.” Throughout India and Tibet, a practice known as a sky burial commences upon death, and the turkey vultures remove the body from the earth. Interestingly, Disney's The Jungle Book movie touches on the importance of vultures in Indian culture. The four vultures sitting in the tree quipping “whatchya wanna do? I dunno what you wanna do?” end up saving Mowgli. Rewatched with my well developed “loathing” of vultures, the song “What'cha Wanna Do” becomes almost comical. The birds sing, “When you're alone/ who comes around/ to pluck you up/ when you are down.” These are the precise habits of a turkey vulture, but they are seen as friends in this bildungsroman.

Different species of vultures are found throughout the world. The Turkey Vulture and Black Vulture are known as New World vultures. Yet none of the old world vultures are even found in the same family as turkey vultures. This suggests a convergent evolution for the role of scavengers in the sky, high soaring birds with bald heads. These bald heads are another reason to admonish the turkey vulture, yet these too serve a purpose. Its pink head keeps it clean as it scavenges and helps prevent disease. A bird with a fully feathered head poking around in carcasses wouldn't be the cleanest and must have been selected against.

On the east coast, turkey and black vultures have become a bit of a problem. Suburbanization tends to favor these birds, as more roads mean more roadkill (to a point) and more landfills. The vultures have been nesting in suburban neighborhoods where their excrement runs down trees and splatters rooftops. A black mass of hundreds of vultures probably violates the suburban aesthetic. As a result he USDA's Animal and Plant Health Inspection Service (APHIS) has harassed tens of thousands of vultures in suburban areas. It is speculated that the black vultures are moving north, partly due to climate change. A warming climate means that the line where carcasses used to freeze is headed north. Along this line, the vultures tip their wings as they pass the growing human populations along the coast. Tipping their wing, thankful for the landfills and the roadkill .

In Wisconsin, turkey vultures often nest on cliffs or concrete structures, secluded from human populations. But about 9 am daily, the vultures soar high above the glacial plains, perhaps seeking an urban heat island, looking for a thermal. Driving on I-94 to the east, past Johnson Creek, I see about 50 vultures hovering over a landfill. Gorging themselves on the offal of our society, turkey vultures are doing alright.

Written by Drew Harry, Faville Grove Land Steward

Photo by David A. Hoffman, Flickr Creative Commons

Clay-Colored Sparrow

Clay-colored sparrows are one our most common grassland birds at Goose Pond Sanctuary. Inexperienced birders can confuse this plain and pale sparrow with field or chipping sparrow but they are easily identified by their harsh, drawn-out monotonous buzzes. Goose Pond Sanctuary Manager Sue Foote-Martin remembers hearing them for the first time at Goose Pond seven years ago when walking in the Browne Prairie.   

In late June and early July, clay-colored sparrows were confirmed nesting in the Browne Prairie for the Breeding Bird Atlas project at Goose Pond. Kristy Larsen observed and then photographed an adult carrying food in the Browne Prairie for the atlas project.

Historically clay-colored sparrows nested in southern Wisconsin. Sam Robbins wrote in 1991 in Wisconsin Birdlife that the last time clay-colored sparrows nested in the Madison area was 1920. He stated that they are a fairly common resident in western and northern Wisconsin and a rare summer resident in southern and eastern Wisconsin.

The first Breeding Bird Atlas project confirmed Sam’s comments. There was only one location in Columbia County for clay-colored sparrows in the first atlas.  In the late 1990’s their habitat was described as “grass and early succession woody habitat”. They like to build their nests in shrubs about two to three feet above the ground. Madison Audubon helped coordinate the development and printing a Grassland Birds of the Midwest poster that lists 25 grassland birds with the clay-colored sparrow missing from the list. At Goose Pond they are nesting in prairies with only a scattering of shrubs.

It will be interesting to see if clay-colored sparrow numbers increase in southern Wisconsin in the second atlas project like they have at Goose Pond Sanctuary. Hike the prairie trails at Goose Pond and observe this interesting sparrow for yourself!

Photo by Tom Benson, Flickr Creative Commons

Willow Flycatcher

A diminutive bird, the Willow Flycatcher moves quickly through lowland shrub communities.  The bird is brown or gray above with white to buff below.  By sight alone, it's almost impossible to tell the willow flycatcher apart from similar species in its genus.  However, its distinctive "fitz-bew" call separates it from the Alder Flycatcher. 

Willow Flycatchers prefer shrubby habitat with willows, elderberry, dogwoods, or honeysuckle.  Their nests are crafted about ten feet off the ground, composed of swamp milkweed, cattails, cottonwood down, and grasses.  

These flycatchers breed mostly in southern Wisconsin, according to the Breeding Bird Atlas, but have been recorded into the far northern reaches of the state.  You can see these birds down Prairie Lane, in the shrubby areas of the Crawfish River floodplain.

Photo by Kelly Colgan Azar, Flickr Creative Commons

Black Tern

Black terns are easily identified as they fly low over large shallow marshes with abundant vegetation adjacent to open water and are enjoyed by many birders.  However, sightings of black terns have declined over the past 10-20 years.
 

Doris Rusch, retired DNR Wildlife Biologist and Red Cedar Lake (Jefferson County) resident, wrote “Every year there are less and less terns. There used to be so many. I count them every time I go out to do the lake survey, so I have some crude documentation as to numbers each month of summer.” The DNR listed the black terns as state-endangered in 2014 as a result of long-term studies which documented state-wide declines and correlate to observations like those from Doris.

Black terns nest in open wetlands on floating bogs or similar habitats and can greatly be impacted by changes in water levels. Heavy rain events raise water levels and can flood out nests. Other problems terns face include predation from great horned owls, great blue herons, and snapping turtles.

David Shealer, Biology Professor at Loras College in Dubuque Iowa, is the national black tern expert. David has banded almost 5,000 black terns in the past 15 years.  For many years David has focused his research in south central Wisconsin. Last year with the assistance of Tony Abate, Goose Pond Sanctuary Land Steward, David trapped a black tern at Grassy Lake State Wildlife Area that was 12 years old and was the oldest band recovery in the nation. This year, David trapped a black tern at Horicon Marsh State Wildlife Area that he banded 14 years ago.

The DNR developed Management Guidelines that if implemented could help remove the black tern from the endangered species list. These guidelines include “Use of artificial nesting platforms may benefit black terns and should be evaluated on a site by site basis.” The rational for nesting platforms is that the platform are attached to poles and can rise with water levels and also help provide a solid substrate for nests.

The DNR provided Madison Audubon Society with funds to purchase materials for nesting platforms and Goose Pond Sanctuary staff and volunteers have been busy constructing, placing, and helping monitor nesting platforms. The nesting platforms are made out of plywood, stryfoam insulation, and astroturf. Special thanks to William Damm for coordinating the construction of 150 nesting platforms and Sara Kerli, DNR Columbia County Wildlife Biologist, who coordinated the construction of 40 platforms.

Nesting platforms have been placed at Grassy Lake, French Creek, and Mud Lake State Wildlife Areas; Rowe and Schoeneberg Marsh Waterfowl Production Areas; and Goose Pond Sanctuary.

As of July 1, over 50 nests have been found at the State Wildlife Areas with most of the nests being found at Grassy Lake. 

Nine terns were observed at Goose Pond in early June and summer interns placed 10 nest platforms. Friends of Rose Lake made and placed platforms at Rose Lake State Natural Area (Dorothy Carnes Jefferson County Park) and David Shealer recently reported seeing 80-100 terns at the SNA! To see the terns, visit the west side of Rose Lake and head to the observation overlook area.

Only a few nests have been on platforms and David’s recommendation next year is that some platforms be moved to different locations. As your local bird conservation organization, we will continue to provide information on the summer nesting results as the season progresses. We look forward to working on this long-tern project and hopes that tern numbers will recover in future years - but we need your help. 

Photo by Arlene Koziol