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Woodrat Bot Fly (Cuterebra americana)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Woodrat Bot Fly.


 Updated: 6/28/2016; Authored By Staff Writer; Content ¬©www.InsectIdentification.org



  Woodrat Bot Fly  
Picture of Woodrat-Bot-Fly


The large Woodrat Bot Fly is a terrible menace to woodland rodents and squirrels as well as domestic cats and dogs, often requiring an eventual trip to the veterinarian.





Woodrat Bot Flies are members of the the Oestridae family. These large, bee mimics do not sting, nor do they bite. This species is, however, a parasite to small mammals in the forest as well as unfortunate pets. The female fly deposits fertilized eggs around the perimeter of a den or hole occupied by a rodent or rabbit. Once the rodent passes by, it picks up an egg in its nose (sniffing around) or mouth. The egg, now inside the animal, moves to the outer body, just under the skin. This may be around the throat, stomach, legs or back. There, the egg enlarges and a tumor-like growth forms on the animal. This is called a warble. The small hole is created in the warble (warble hole) that will allow the hatched fly larva to breathe. The larva (maggot) is worm-like, plump and grows in size. When it is ready to pupate, it leaves the warble through the hole and falls to the ground. This usually leaves the animal with a large gaping wound that can easily become infected if not treated. Pets with a warble can be brought to a veterinarian, where the Woodrat Bot Fly larva may be removed and the warble hole treated so that it heals. The newly-freed larva will encase itself on the ground and pupate, emerging as a flying adult.

As a parasite, the Woodrat Bot Fly does not kill its host, but it can make it uncomfortable and even sick if not treated.

Basic Information
Common Name: Woodrat Bot Fly
Other Name(s): Warble Fly, Heel Fly
Scientific Name: Cuterebra americana
Category: Fly or Mosquito


General Identification
Size (Adult; Length): 20mm to 30mm (0.78in to 1.17in)
Colorwheel Graphic
Identifying Colors: black, orange
Additional Descriptors: flying, fat, large, round, hairy, big, harmful, wolves




Taxonomic Hierarchy
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Family: Oestridae
Genus: Cuterebra
Species: americana




Territorial Reach (A-to-Z)
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed below as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections below indicate that the subject in question has not been reported in that particular territory. U.S. states and Canadian provinces / territories are clickable to their respective bug listings.
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
Canadian National Flag Graphic
Alberta
British Columbia
Manitoba
New Brunswick
Newfoundland and Labrador
Nova Scotia
Ontario
Prince Edward Island
Quebec
Saskatchewan
Mexican National Flag Graphic
Mexico


Territorial Area Map (Visual Reference Guide)
The map below showcases (in red) the states and territories of North America where the Woodrat Bot Fly may be found (but is not limited to). This sort of data can be useful in seeing concentrations of a particular species over the continent as well as revealing possible migratory patterns over a species' given lifespan. Some species are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America.
Alaska  
Hawaii  
Prince Edward Is.  
State of Alabama graphic
State of Arizona graphic
State of Arkansas graphic
State of California graphic
State of Colorado graphic
State of Delware graphic
State of Florida graphic
State of Georgia graphic
State of Idaho graphic
State of Illinois graphic
State of Indiana graphic
State of Iowa graphic
State of Kansas graphic
State of Kentucky graphic
State of Louisiana graphic
State of Maine graphic
State of Maryland graphic
State of Michigan graphic
State of Minnesota graphic
State of Mississippi graphic
State of Missouri graphic
State of Montana graphic
State of Nebraska graphic
State of Nevada graphic
State of New England graphic
State of New Jersey graphic
State of New Mexico graphic
State of New York graphic
State of North Carolina graphic
State of North Dakota graphic
State of Ohio graphic
State of Oklahoma graphic
State of Oregon graphic
State of Pennsylvania graphic
State of South Carolina graphic
State of South Dakota graphic
State of Tennessee graphic
State of Texas graphic
State of Utah graphic
State of Virginia graphic
State of Washington graphic
State of West Virginia graphic
State of Wisconsin graphic
State of Wyoming graphic
Canadian territory of Alberta graphic
Canadian territory of British Columbia graphic
Canadian territory of Manitoba graphic
Canadian territory of New Brunswick graphic
Canadian territory of Newfoundland and Labrador graphic
Canadian territory of Ontario graphic
Canadian territory of Quebec graphic
Canadian territory of Saskatchewan graphic
Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic


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