marsh

Sora

Print Friendly and PDF

Chris Ribic in 2006 wrote in the Atlas of the Breeding Birds of Wisconsin, “Clap your hands in a wetland or slap your canoe paddle on the water in May or June, and you will likely hear the whinny of North America’s most common rail.” 

Ribic also reported that Wisconsin wetland bird researchers “have found that sora occur in higher densities in cat-tail or bulrush marshes compared to sedge/grass meadows.”  We search for them in shallow water areas.

Range map provided by Cornell Lab of Ornithology

Range map provided by Cornell Lab of Ornithology

If you are lucky to see this small rail (that weighs less than three ounces) fly, it appears to be a weak flyer and only flies short distances.  But don’t be fooled by this illusion: soras migrate south hundreds of miles to the coastal marshes and central America for the winter. 

The Cornell Lab of Ornithology reports “Their population was stable between 1966 and 2015… they rely on wetland habitat that is dwindling due to urban and agricultural development”.  In Columbia County, we where we are conducting the Breeding Bird Atlas II surveys, we are finding soras in several thousand acres of restored Wetland Reserve Program (WRP) lands.

Columbia County atlasers have been out for the past four nights and are impressed with the number of soras found.  Mark and Brand Smith walked in a large WRP wetland for 1.5 miles from 8:45 p.m. to 10:30 p.m. They stopped seven times and played songs/calls of sora, Virginia rail, least bittern, and American bittern and were rewarded by hearing 22 sora and two American bitterns. Only one sora called before the recording of the call was played. (Click here to read about the “Proper Use of Playback in Birding”.)

Mark and Brand also stopped at two other sites along a road in a sedge meadow and found nine soras and three Virginia rails, all within 100 yards of the stops. 

Sora rail (check out its giant feet!). Photo by Becky Matsubara

Sora rail (check out its giant feet!). Photo by Becky Matsubara

We always thought that the best time for surveying for rails was after sunset and before sunrise. However, we learned that they can also call during the day when Brand was surveying for red-shouldered hawks by playing the hawk call and a sora answered. He then switched to calling rails and had replies from 8 Virginia and 11 soras. Impressive, since he was out in the early afternoon.

Our goal is to search the 18 priority atlas blocks in Columbia County for rails and bitters in the next month. Graham searched all the rail habitat (less than five acres) in the Arlington CE block and was lucky to hear a sora that was calling within 100 yards of the interstate.

Mark and Graham recently conducted a waterfowl count at Goose Pond and flushed four sora rails. On May 16, they conducted a rail count on a beautiful spring night with a lot of frogs and toads calling, and two males responded to the calls. They will survey again in a week and if they hear the rails call, the species will be upgraded to “probably nesting” in the Breeding Bird Atlas II project.

We encourage you to check out “rail” wetlands and see what you can find. Two locations in Jefferson County to explore are Zeloski Marsh (purchased by Madison Audubon and donated to the DNR) and Rose Lake/Dorothy Carnes Park (donated to Jefferson County) near Fort Atkinson. Look for shallow waters with cattails, bullrushes, and marshy habitat. You might get lucky enough to hear that magical whinny.

We are always looking for help with the atlas and welcome rail surveyors (goosep@madisonaudubon.org) or you can help with the DNR survey for Secretive Marsh Birds including rails. There are 13 open routes within Madison Audubon’s chapter boundaries.

Written by Mark Martin and Sue Foote-Martin, Goose Pond Sanctuary resident co-managers

Cover photo by Arlene Koziol

Marsh Wren

Print Friendly and PDF

Video/audio by brevardjay (YouTube)

Many visitors to Goose Pond this spring and summer were rewarded by hearing the rich harsh staccato with few pure musical notes of the marsh wrens around the edges of the pond. 

Sam Robbins wrote “In summer this is a “fun bird” to see and hear. You can stand near a cattail marsh before dawn, after dusk, or even in the middle of the night, and hear the delightful rattle of the “long-bill”. Once it is light, you can see considerable activity as the nervous birds move around.”

Marsh wrens, formerly called long-billed marsh wrens, can be confused with sedge wrens. The easiest way to separate the two is by knowing their preferred habitat. Marsh wrens live in deep or shallow cattail or river bulrush marshes while sedge wren nest in sedge meadows and wet to mesic prairies.

Photo by Mick Thompson

Photo by Mick Thompson

Most marsh wren nests are 2–5 feet above the ground and are dome-shaped, with strips of cattail, sedges (bulrush), and grasses woven together. The nest is oblong with a small hole at the top and an enclosed cup at the bottom. The nest is about 7 inches tall and 5 inches wide. Females line the active nests with strips of grass, sedge, cattail down, feathers, and rootlets. Clutches can range between 3-10 brown spotted eggs and the incubation/nesting period is 25 to 31 days long.

A marsh wren nest is well hidden in the cattails. Photo by Graham Steinhauer

A marsh wren nest is well hidden in the cattails. Photo by Graham Steinhauer

Males migrate north before females and build a number of nests in preparation for their arrival. Once the females arrive, the male escorts the lady he is courting to his various nests, putting on quite a display of bowing, bobbing, and showing off his tail and his handiwork. The female selects a mate and she may build her own nest if his nests do not suit her. Together, they defend their nesting territory, and even destroy the eggs and nestlings of other marsh wrens and nesting birds. Males often mate with multiple females in the area (does he take these ladies on the same tour of his collection of nests that the previous female dismissed as inadequate?).

Our goal this year was to confirm marsh wrens nesting at Goose Pond. Wisconsin Department of Natural Resources staff Daryl Christensen and Sumner Matteson found 10 males calling in mid-June while surveying for eared grebes, but unlike some other bird species (like eared grebes), marsh wrens cannot be confirmed by seeing the birds carry nesting material. A pair can build a number of “dummy” nests, and in fact, researchers have found that male marsh wrens may build up to 22 nests!

The first week in July, Goose Pond manager Mark Martin, land steward Graham Steinhauer, and interns Siena Muehlfeld, Tanner Pettit, and Henry Weidmeyer searched for marsh wrens on the north side of the pond. This was a new experience for the interns and they thought it would be easy to confirm nesting for the Breeding Bird Atlas project. It started out strong: six males were found calling in a two-acre area.

Henry, Tanner, and Graham search through river bulrush in knee-deep water on the north side of Goose Pond. The quest: marsh wren nests. Photo by Mark Martin

Henry, Tanner, and Graham search through river bulrush in knee-deep water on the north side of Goose Pond. The quest: marsh wren nests. Photo by Mark Martin

When the first of 12 nests was found the interns thought that the species was confirmed. Mark mentioned that marsh wrens build many nests, so a confirmed nest has to contain eggs or young. Since one cannot see into the nests, and Mark recommended they gently poke a finger through the entrance hole and see if eggs or young could be felt. At nest #10, Tanner found a nest with 3 eggs – a new confirmed species at Goose Pond! And those six singing marsh wrens? Tanner noted that “nests were always found near singing males.”

The federal breeding bird surveys conducted in the United States from 1966 to 2015 found an increase in marsh wren numbers by 130% and researcher estimated their population at 9.7 million, putting them in to the category of "low conservation concern." However, draining and filling wetlands and marshes could create problems for this species. Conservation Biologist Randy Hoffman said that the largest numbers of marsh wrens in North America is found at Horicon Marsh, which is also the largest cattail marsh in North America.

We are still on the look-out for marsh wren nests, as there's still time for nestlings to grow big and strong enough to make the fall migration to Florida, Texas, New Mexico, Arizona, and Mexico. On July 24, Daryl and Sumner checked on our wetland birds and found six males still calling and observed males carrying bulrush leaves to the arrowhead for constructing nests. Will we have another chance to gently poke our fingers into nests and find more eggs? Stay tuned to find out!

Written by Mark Martin and Susan Foote-Martin, Goose Pond Sanctuary resident managers, and Brenna Marsicek, director of communications

Cover photo by Arlene Koziol