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Crazy Ant (Nylanderia fulva)

Crazy Ant (Nylanderia fulva)

Our nation is being invaded!  The intruders number in the millions.  They are wiping out entire ecosystems, destroying electronics, and setting fires.  Fortunately the invading species, Nylanderia fulva, is rather small:  each individual measures only 3.2 mm (.12 inches).  In 2002 the ants arrived on America’s Gulf Coast from Argentina or Brazil where they live naturally. These ants are called Nylanderia fulva because of their brownish yellow fulvous color, but in America they are more commonly known as crazy ants (thanks to their erratic and non-linear walking patterns) or Rasberry ants—in honor of Tom Rasberry a Texas exterminator who discovered them in Texas.

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The crazy ants have spread extensively in Texas and Florida and they have footholds in Mississippi and Louisiana.  They are highly successful foragers and hunters of small arthropods and, like some other ants, they farm aphids (!).  Nylanderia fulva is capable of forming extremely large hives with multiple queens—which gives them surprising immunity from many common American insecticides and ant-killing chemicals.  They are out-competing native fire ants and changing the micro-fauna of the areas where they are flourishing.

Crazy-ants

For whatever reason, crazy ants are attracted to electronics.  Because of their small size, they climb inside all sorts of switches, circuit boxes, and electric gizmos.  If an ant stumbles into a transistor and dies, its corpse emits a chemical which causes fellow hive members to rush to the scene (this is an evolutionary strategy for fending off attackers).  Unfortunately, the reinforcement ants are themselves electrocuted which causes a grim feedback scenario.  These ant death spirals can cause electronics to become disabled, or switch permanently on/off, or just catch fire (since they are jam packed with electrified ant corpses).

The Fulvous Whistling Duck (Dendrocygna bicolor) photo by Bob Hall

Fulvous is a color which is very prevalent in the natural world.  It is a dull mixture of yellow and brown with hints of red.   The name comes from the Latin word “fulvus” which translates as “a dull yellow-brown color with a hint of red” (sometimes etymology is easy).  Since “fulvus” is a Latin word there are a shocking number of animal species which have the color incorporated in their binomial scientific name.   There are also quite a few creatures (particularly birds) known as the fulvous such-and-such in English.  Here is a little gallery of fulvous/fulvus beasties.

Cryptocephalus (Burlinius) fulvus, photographed by Josef Dvořák

 

Pacific Golden Plover (Pluvialis fulva)

 

The common brown lemur (Eulemur fulvus) photo by Emmanuel Van Heygen

 

The Fulvus Roundleaf Bat (Hipposideros fulvus) painting by Gray, 1838

 

The Fulvous Owl (Strix fulvescens)

 

The Fulvous Forest Skimmer (Neurothemis fulvia)

 

Fulvous-breasted Woodpecker (Dendrocopos macei)

 

The tawny grisette (Amanita fulva)

 

The Fulvous Limpet (Iothia fulva)

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