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Blackpoll Warbler
blackpoll warbler
Blackpoll warbler, photographed at Green Cay Nature Center, Boynton Beach, Palm Beach County, in May 2016.
blackpoll warbler
 

At first glance, you might think this black and white warbler is a black-and-white warbler. As in Mniotilta varia.

But a closer look will tell you that this little guy is a blackpoll warbler, Setophaga striata. The difference between the two warbler cousins comes down to two easily spotted physical characteristics — the blackpoll's solid black "skull cap" that extends to the eyes, and its bright orange legs. The black-and-white has a wide white line above the eye and its legs are dull.

The blackpoll is also a migratory visitor to South Florida. It only makes pit stops here on it's way to someplace else — almost always in spring — while the black-and-white winters here.

And the blackpoll is one astounding migrator. There are birds that make longer migratory trips but few rival the way this one travels.

Blackpolls spend the summer breeding season in the north woods of Canada and Alaska, occasionaly as far south as New England. Their preferred habitat is spruce forests, and thickets in places so far north that tree won't grow. In the fall, they move to the coast to begin the annual trip to South America. Some will take a break in Bermuda (and a few have been seen in Florida) but most make a nonstop flight of three or four days between the North Atlantic coastline and the Caribbean — nearly 2,000 miles. Their ultimate destination: the tropical forests of Colombia, Venezuela and Brazil. The secret to their marathon flight: they double their weight during summer, and take advantage of a shift in the prevailing winds.

Their trip back north is taken at a more leisurely pace that brings them to South Florida, as well as much of the eastern and central United States.

 
 
blackpoll warbler
 

The blackpolls photgraphed on this page lingered a couple of days in the woods surrounding the Green Cay Nature Center in Boynton Beach.

Blackpolls are fairly large as warblers go, with a body that's between five and six inches long and a wingspan that can exceed nine inches. Breeding males are sharp blacks and whites above and mostly white below. As noted above, they have a solid black patch on the head, down to the eyes, and bright orange legs. Breeding females are gray-green, with black streaks on the head and back. Nonbreeding males lose the black skull caps.

Their diet is bugs and berries — the birds here were in a fig tree, most likely feasting on the fruit. They forage by creeping through trees, picking insects off the leaves, branches and bark. They'll also dart out to grab flying insects.

Blackpolls usually have one brood a season, but can have a second. There are four or five eggs per clutch, which the females incubate for about 12 days. While mom sits, dad brings her food. Once hatched, the young stay nest-bound for about 12 more days, during which they're fed by both parents.

Blackpolls are common warblers but their numbers are declining, with loss of habitat, especially in South America, the biggest threat. They are members of Parulidae, the wood warbler family.

Photographs by David Sedore

 
     
     
 
Links for Blackpoll Warbler Cornell Laboratory of Ornithology National Audubon Society National Geographic Society
 
Unless otherwise stated, all photographs are property of the publishers and may not be used without their express permission.