Rare and Vagrant Migratory Birds Find Refuge at Corkscrew Swamp Sanctuary

Think about you’re a migratory songbird flying south for the winter. Your flight path, which can have began within the boreal forest of japanese Canada, takes you over mountains, valleys, farms, and concrete areas. Typically you get to a location the place land ends and water begins, corresponding to South Florida, the place you search for a spot to cease, relaxation, and refuel earlier than crossing the Gulf or Caribbean Sea.

For hundreds of birds yearly, Corkscrew Swamp Sanctuary is the right migratory resting place. A Ramsar-designated Wetland of Worldwide Significance and the regional gateway website for the Nice Florida Birding and Wildlife Path, Corkscrew Swamp Sanctuary is a key location on the Atlantic Flyway for migrating birds. Over time, greater than 268 hen species have been recorded right here, together with many uncommon and vagrant species, so it’s no surprise the Sanctuary can be designated as an Audubon Vital Chicken Space.

The Canada Warbler

Throughout migration, birds flock to the mosaic of habitats protected by the 13,000-acre Sanctuary. Sanctuary Director Keith Laakkonen was in the suitable place on the proper time in September to identify a uncommon species, a Canada Warbler, foraging within the bushes close to the North Lettuce Lake.

Curiously, many of the vary maps for this hen don’t present Florida in any respect. After their breeding season ends, most Canada Warblers journey west of the Appalachian Mountains to Mexico and keep away from southeastern states altogether.

“There are all the time just a few Canada Warblers that come down via Florida this time of yr,” says Laakkonen. “The southeast coast of the Sunshine State will get greater than we do right here in southwest Florida,” he added.

In keeping with Laakkonen, this was solely the third Canada Warbler ever recorded on eBird on the Sanctuary, though not less than seven have been documented in Collier County in current many years. As a result of Collier County is bigger than the state of Delaware, many extra are seemingly passing via undetected. Some could also be migrating throughout the Caribbean quite than following a land route. Researchers have recognized three genetically distinct populations of Canada Warbler, and maybe this might affect some migration routes.

Different Uncommon Guests

Dozens of uncommon or “vagrant” birds have been reported on the Sanctuary in recent times. Simply final yr, workers and guests reported an overwintering Wilson’s Warbler, a Western Tanager, and a Lazuli Bunting, to call just a few.

Bryant Dossman, PhD, director of the Audubon Everglades Analysis Station, says that vagrants are attention-grabbing in that they’re uncommon occurrences by nature. “We discover them in Florida generally as a result of we’re alongside their common trajectory,” he says.

How Birds Migrate

Songbirds use a number of cues to navigate, together with proteins of their eyes that enable them to ‘see’ geomagnetic inclinations, in addition to celestial cues for nighttime migration. Below all this, birds even have a genetic migratory program or ‘map’ that gives a common purpose vacation spot and route that may be honed by age and expertise. Nevertheless it’s not foolproof, and neither are their navigational talents; so it isn’t uncommon to count on that some birds will get misplaced.

Typically it’s a random storm system, corresponding to Hurricane Idalia in 2023, that blew tons of of American Flamingos off target throughout their migration between Cuba and Mexico and deposited them in Florida and past. A lot of these flamingos stay within the Sunshine State in the present day.

Different occasions, it’s a younger hen migrating for the primary time. “The primary migration is all the time probably the most tough since younger birds are relying solely on their inner map and don’t have the posh of expertise to information them, and so even small disturbances can lead them off target. And generally these inner maps can simply be mistaken once they haven’t skilled migration earlier than,” Dossman provides.

What Turns into of These People?

It’s tough to know for positive what occurs to many of those birds. Some seemingly perish. In keeping with Dossman, monitoring is the one software now we have to grasp the place they find yourself.

“Typically a hen can get fortunate, discover good habitat, and survive winter to return north the next spring,” says Dossman. “Or it could possibly be an early colonizer that returns the next yr, probably founding a inhabitants in a brand new space, which, over lengthy sufficient timelines, is a method they find yourself turning into new subspecies,” he explains.

Migratory Chicken Monitoring

There may be nonetheless a lot to find out about migratory birds, and plenty of scientists use monitoring units to review hen habits. The  Motus Wildlife Tracking System  is a world, collaborative community run by  Birds Canada  that makes use of automated radio telemetry to trace small flying animals, significantly birds, in actual time. The Motus station put in at Corkscrew Swamp Sanctuary has detected 28 birds of 17 species since 2022.

The Bird Migration Explorer from Audubon’s Migratory Chicken Initiative and companions is a web based initiative that mixes information from Motus and plenty of different sources. The result’s a information accessible to any hen fanatic inquisitive about studying concerning the heroic annual journeys made by greater than 450 hen species and the challenges they face alongside the best way.

For greater than a century, Audubon has been working to safe and protect the habitats birds depend on for his or her breeding, migration, and different important wants. Birds inform us that they want locations like Corkscrew Swamp Sanctuary yearly, particularly as migration brings all kinds of birds this manner. Human guests additionally depend on the Sanctuary as a spot to spend time in nature.